https://w140.com/tekwiki/api.php?action=feedcontributions&user=Vintage+dave&feedformat=atomTekWiki - User contributions [en]2024-03-28T14:51:39ZUser contributionsMediaWiki 1.40.0https://w140.com/tekwiki/index.php?title=User_talk:Kurt&diff=92063User talk:Kurt2024-03-18T18:45:23Z<p>Vintage dave: /* 1A7A Coarse DC Offset knob color */ new section</p>
<hr />
<div>== OK to extract encrypted PDF? ==<br />
<br />
I was pleased to see that we had the 465B Service Manual - but it has no OCR<br />
<br />
I tried to OCR but it's protected with empty password<br />
<br />
Is it OK for me to upload a replacement for this?<br />
<br />
Author is maintenance script<br />
<br />
[[Media:070-2757-00.pdf]]<br />
<br />
<br />
but upload metadata and watermark in the PDF is a broken link<br />
http://manoman.sqhill.com<br />
<br />
http://sqhill.com the domain exists but wants a login.<br />
[[User:Qfissler|Qfissler]] ([[User talk:Qfissler|talk]])<br />
<br />
----<br />
The manuals with the manoman.sqhill.com watermark were available for free download<br />
with no login or other restrictions. The scans seem to have been created with altruistic<br />
intentions, not for any sort of selfish gain. Somebody made a copy before the download links<br />
were shut down. OCRing the documents seems consistent with the intentions<br />
of the person who did the scanning, i.e., to make the information available, useful, etc.<br />
Removing the encryption so it can be OCRed seems fine to me. Peter, what do you think?<br />
[[User:Kurt|Kurt]] ([[User talk:Kurt|talk]]) 12:01, 28 May 2023 (PDT)<br />
:I regularly remove the password on PDFs for OCRing, e.g with pdf.io. --[[User:Peter|Peter]] ([[User talk:Peter|talk]]) 12:46, 29 May 2023 (PDT)<br />
----<br />
Thanks - I thought it would be OK (and in fact pre-empted your answer after reassuring myself) - I was just concerned about exposing the team to any litigation - on reflection, clearly the IP was owned by Tektronix... Still don't know why it was encrypted - maybe just a default in the software used...<br />
Thanks!<br />
[[User:Qfissler|Qfissler]] ([[User talk:Qfissler|talk]])<br />
<br />
== 531 Du Mont reference found ==<br />
<br />
Hey, Kurt - I saw you asked for a ref for the Du Mont used in the 531 - I found a source and replied there at [[Talk:531]]<br />
<br />
[[User:Qfissler|Qfissler]] ([[User talk:Qfissler|talk]]) 02:31, 15 July 2023 (PDT)<br />
<br />
== 7A18N photo ==<br />
<br />
Hey, Kurt - do you still have the 7A18N you took a photo of?<br />
<br />
[[Media:Tek_7a18n.jpeg]]<br />
<br />
The manual shows the N without the "Identify" concentric to the position controls. I'd love to see the inside.<br />
(I'll add photos of mine) [[User:Qfissler|Qfissler]] ([[User talk:Qfissler|talk]]) 03:22, 11 August 2023 (PDT)<br />
<br />
:I think the photo was from an Ebay listing, not a plug-in that I own. [[User:Kurt|Kurt]] ([[User talk:Kurt|talk]]) 10:34, 11 August 2023 (PDT)<br />
<br />
== 1A7A Coarse DC Offset knob color ==<br />
<br />
Hi, Kurt. You added this to the 1A7A page:<br />
===================<br />
There are two styles of 1A7A.<br />
One has a red knob controlling the coarse DC offset <br />
and the other has a black knob controlling the coarse DC offset.<br />
===================<br />
<br />
The manual scan linked on the page, whose high serial number is B062300, lists that knob as two different part numbers but both are charcoal. Could your red knob have been someone's repair?</div>Vintage davehttps://w140.com/tekwiki/index.php?title=535&diff=907075352024-02-04T18:22:57Z<p>Vintage dave: early vs late delay line position</p>
<hr />
<div>{{Oscilloscope Sidebar<br />
|manufacturer=Tektronix <br />
|series=500-series scopes <br />
|model=535 <br />
|summary=10 (15) MHz dual-timebase scope <br />
|image=Tek-535a-crop.jpg <br />
|caption=Tektronix 535A front <br />
|introduced=1954 <br />
|discontinued=1973 <br />
|designers=Dick Rhiger <br />
|manuals=<br />
'''535'''<br />
* [[Media:070-198.pdf | Tektronix 535 Manual]]<br />
* [[Media:tek_type_535_545_operators_handbook.pdf|Tektronix 535 and 545 Operators Handbook]] (OCR)<br />
* [[Media:tek_type_535_modification_summary.pdf|Tektronix 535 Modification Summary]] (bad-OCR)<br />
* [[Media:navair_17-20aw-08_manual.pdf|Navair 17-20AW-08 Manual, which discusses the 535]] (OCR)<br />
'''535A'''<br />
* [[Media:070-0145-01.pdf | Tektronix 535A Manual]] (OCR)<br />
* [[Media:Using your 535A or 545A.pdf|Using your 535A or 545A (1960)]]<br />
* [[Media:Operators Handbook 535A 545A 1959.pdf|Tektronix 535A and 545A Operator's Handbook 1959]]<br />
<small><br />
'''Calibration'''<br />
* [[Media:tek_type_535_fcp_low-sn.pdf|Tektronix 535 Factory Calibration Guide low-sn]] (OCR)<br />
* [[Media:tek_type_535_fcp_high-sn.pdf|Tektronix 535 Factory Calibration Guide high-sn]] (OCR)<br />
* [[Media:tek_type_535a_fcp.pdf|Tektronix 535A Factory Calibration Guide, August 1959]] (OCR)<br />
* [[Media:Tek 535a fcp march 1968.pdf|Tektronix 535A Factory Calibration Procedure, March 1968]] (needs OCR)<br />
</small><br />
}}<br />
The '''Tektronix Type 535''' is a 10*/15 MHz dual-timebase oscilloscope that accepts [[letter-series and 1-series plug-ins]].<br />
<br />
The 535 is functionally the same as the 30-MHz [[545]], but with a simpler, non-distributed vertical amplifier.<br />
Early 535s came in brown, square-cornered cabinets; in 1956 the cabinet became blue and round-cornered.<br />
<br />
Type 535, the single-timebase Type [[531]], and the first four plug-ins, Types 53[[A]], 53[[B]], 53[[C]], and 53[[D]],<br />
were [[introduced in 1954|introduced in August 1954]], advertised as ''"... the «convertibles» of the Tektronix line"''.<br />
Types [[541]] and [[545]] [[introduced_in_1955|came out in March 1955]].<br />
<br />
In 1959, Types [[531]], 535, [[541]], and [[545]] were superseded by Types 531A, 535A, 541A, and 545A, which have more convenient controls. <br />
In addition, Types 531A and 535A have slightly faster (15 MHz vs. 11 MHz) vertical amplifiers.<br />
<br />
There is also a rack-mount version, Types RM35 and RM35A. <br />
<br />
Starting in 1963, the 535A was made with [[BNC connector]]s for the external trigger inputs. <br />
Prior to 1963, the external trigger inputs used [[UHF connector]]s. <br />
1972 was the last year that any version of the 535 was sold. <br />
In 1973, the 54x series was still available, but nothing from the 53x series. <br />
<br />
The first 535s had brown slide-out cases, then blue slide-out cases, and finally blue cases with pop-off sides. <br />
<br />
<nowiki>*</nowiki> With Type [[A]] or [[B]] plug-in; 11 MHz with Type [[K]] or other fast plug-in.<br />
<br />
{{BeginSpecs}}<br />
{{SpecGroup | 535 SN 101-8627: Double-terminated delay line}}<br />
{{Spec | Bandwidth | DC to 10 MHz (≤ 3 dB) with [[A|Type A plug-in]] }}<br />
{{Spec | Rise time | 0.035 μs }}<br />
{{SpecGroup | 535 SN 8268 up & 535A: Single-terminated delay line}}<br />
{{Spec | Bandwidth | DC to 15 MHz (≤ 3 dB) with [[K|Type K plug-in]] }}<br />
{{Spec | Rise time | 0.024 μs }}<br />
{{SpecGroup | all}}<br />
{{Spec | Line Voltage | 108/115/122/216/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz. }}<br />
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}<br />
{{Spec | Power Consumption | 500 W with [[CA|Type CA plug-in]] }}<br />
{{Spec | Cooling | AC Fan }}<br />
{{Spec | Trigger Modes | AC/DC/AC LF Reject, and HF Sync}}<br />
{{Spec | CRT | early models, [[5BG]]P2, part number [[154-081]]; late models, [[T51]]; 10 kV acceleration, 6 cm × 10 cm screen}}<br />
{{Spec | Construction | Aluminum alloy chassis. Anodized front panel}}<br />
{{Spec | Weight| 65 lbs / 29.5 kg }}<br />
{{EndSpecs}}<br />
<br />
==Links==<br />
{{Documents|Link=535}}<br />
{{Documents|Link=535A}}<br />
<br />
==Special Models==<br />
Three "special models" of 535 were made:<br />
* 535-S1 (sweep delay 10 microseconds to 1 second)<br />
* 535-S2 (sweep delay 100 microseconds to 10 seconds)<br />
* 535-S6 (sweep delay 1.5 microseconds to 10 seconds)<br />
<br />
The delaying timebase on the standard non-A 535 supports delays up to 100 milliseconds.<br />
The 535-S1 supports delays up to 1 second, the 535A up to 10 seconds. <br />
<br />
From [[Media:Service_Scope_01_Oct_1959.pdf|ServiceScope No.1, October 1959]]:<br />
<blockquote><br />
In Type 535 and 545 the total delaying sweep time is limited to 10 ms/cm.<br />
If a total delaying sweep time in excess of 10 ms/cm is required, a K535-S1 modification kit (Tek #040-063) which gives a maximum delay sweep range of 1 s/cm. <br />
This kit is available for $40.00 in including a new front panel.<br />
</blockquote><br />
<br />
==Internals==<br />
Triggering is done with a Schmitt trigger made of a [[6U8]] tube (in early instruments) or a [[6DJ8]] tube (in late instruments).<br />
<br />
Early 535s had [[selenium rectifiers]]. The 535 has a [[thermal cutoff]].<br />
<br />
===Power Supply===<br />
<br />
The 535's power supply provides regulated outputs of −150V, +100V, +225V, +350V, +500V as well as a +325 V unregulated output for CRT HV section.<br />
<br />
The Power supply section is very similar to a [[549]]. It is an all tube design using <br />
: [[5651]] as Voltage reference<br />
: [[12AX7]] as comparator<br />
: [[12B4]] as -150V series pass element<br />
: [[6080]] as +100V, +225V and +350V series pass element<br />
: [[12B4]] as +500V series pass element<br />
: [[6AU6]] as error amplifier for all rails<br />
<br />
==Links==<br />
<br />
* [https://richardsears.wordpress.com/2011/06/18/tektronix-and-early-hewlett-packard/ Comparison of Tektronix 535, 535A, and HP 150A] with detailed pictures<br />
* [[120-086]] Power transformer schematic<br />
<!-- dead link 2023-03-27 * [http://www.lydecker.org/Tektronix_535A.htm Tektronix 535A - Restoring a Swap Meet Find] --><br />
<br />
==Pictures==<br />
===535===<br />
<gallery><br />
Tek 535 brown 1.jpg|535 with brown case<br />
Tek 535 brown 2.jpg|535 with brown case<br />
Tek 535 brown 3.jpg|535 with brown case<br />
Tek 535 brown 4.jpg|535 with brown case<br />
Tek 535 brown 5.jpg|535 with brown case<br />
</gallery><br />
===RM 35===<br />
<gallery><br />
Tek rm35.jpg<br />
Tek rm35 2.jpg<br />
Tek rm35 3.jpg<br />
Tek rm35 4.jpg<br />
</gallery><br />
===535 S1===<br />
<gallery><br />
1.TEK535.JPG|535 S1<br />
2.TEK535.JPG|535 S1<br />
3.TEK535.JPG|535 S1<br />
4.TEK535.JPG|535 S1<br />
5.TEK535.JPG|535 S1<br />
6.TEK535.JPG|535 S1<br />
7.TEK535.JPG|535 S1<br />
</gallery><br />
===535 S2===<br />
<gallery><br />
Tek 535-s2 1.jpg|535-S2<br />
Tek 535-s2 2.jpg|535-S2<br />
Tek 535-s2 3.jpg|535-S2<br />
</gallery><br />
===535A===<br />
<gallery><br />
535A.jpg|535A<br />
535_vertical2.png|vertical amplifier<br />
Wellenkino 535a 3.jpg<br />
Wellenkino 535a 2.jpg<br />
Tek 535a delay line 1.jpg|535A delay line<br />
Tek 535a delay line 2.jpg|535A delay line<br />
Tek 535a trace.jpg|535A trace<br />
Tek 535a on plastic.jpg|535A<br />
</gallery><br />
====535A Internals====<br />
<gallery><br />
Tek_535A-LHS.jpeg | LHS<br />
Tek_535A-RHS.jpeg | RHS<br />
Tek_535A-RHS1.jpeg | RHS<br />
Tek_535A-top.jpeg | Top (without HV Shields)<br />
Tek_535A-Underside.jpeg | Underside<br />
<br />
<br />
</gallery><br />
===RM35A===<br />
<gallery><br />
Tek rm35a 1.JPG<br />
Tek rm35a 2.jpg<br />
Tek rm35a 3.jpg<br />
Tek rm35a 4.jpg<br />
Tek rm35a 5.jpg<br />
Tek rm35a 6.jpg<br />
Tek rm35a 7.jpg<br />
Tek rm35a 8.jpg<br />
Tek rm35a 9.jpg<br />
Tek rm35a 10.jpg<br />
Tek rm35a 11.jpg<br />
Tek rm35a 12.jpg<br />
Tek rm35a 13.jpg<br />
Tek rm35a 14.jpg<br />
Tek rm35a 15.jpg<br />
Tek rm35a 16.jpg<br />
Tek rm35a 17.jpg<br />
Tek rm35a 18.jpg<br />
Rm35a front.jpg|R35A front<br />
Rm35a trig panel.jpg|R35A trigger controls<br />
Tek-RM35A-HV-Section.jpg | RM35A HV Section<br />
Tek-RM35A-A-Inten-B.jpg | RM35A B intensified by A Trace <br />
Tek-RM35A-Inside-Live.jpg |RM35A Internals<br />
Tek-RM35A-Live-Tubes.jpg |RM35A Internals<br />
Tek rm35a trace.jpg|RM35A trace<br />
Tek rm35a rear2.jpg|RM35A rear<br />
Tek rm35a rear.jpg|RM35A rear<br />
</gallery><br />
===RM35AR===<br />
<gallery><br />
Tek rm35ar 1.jpg|RM35AR (mod 116B)<br />
Tek rm35ar 2.jpg|RM35AR (mod 116B)<br />
Tek rm35ar 3.jpg|RM35AR (mod 116B)<br />
Tek rm35ar 4.jpg|RM35AR (mod 116B)<br />
Tek rm35ar 5.jpg|RM35AR (mod 116B)<br />
</gallery><br />
<br />
{{Parts|535}}<br />
{{Parts|535A}}<br />
{{Parts|RM35}}<br />
{{Parts|RM35A}}<br />
<br />
<br />
[[Category:500 series scopes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=531&diff=907065312024-02-04T17:32:17Z<p>Vintage dave: early delay line is not "before" the vertical amp, it's in the middle</p>
<hr />
<div>{{Oscilloscope Sidebar<br />
|manufacturer=Tektronix<br />
|series=5000-series scopes<br />
|model=531<br />
|summary=10 MHz oscilloscope<br />
|image=Tek 531a g front.jpg<br />
|caption=Tektronix 531<br />
|introduced=1954<br />
|discontinued=1973<br />
|designers=Dick Rhiger<br />
|manuals=<br />
'''531'''<br />
* [[Media:070-203.pdf|Tektronix 531/541 Manual]] (OCR)<br />
* [[Media:tek_531_fcp.pdf|531 Factory Calibration Procedure]] (OCR)<br />
<br />
'''531A'''<br />
* [[Media:070-301.pdf|Tektronix RM31A Manual]]<br />
* [[Media:tek_531a_fcp.pdf|531A Factory Calibration Procedure]] (OCR)<br />
* [[Media:Tek 531a fcp feb 1968.pdf|531A Factory Calibration Procedure, February 1968]]<br />
* [[Media:Tek 531a mods.pdf|Tektronix 531A Modifications]]<br />
}}<br />
The '''Tektronix Type 531''' is a 10 MHz oscilloscope that accepts [[letter-series and 1-series plug-ins]].<br />
It is exactly like Type [[535]] except it does not have the Delayed Sweep (dual timebase) feature.<br />
<br />
The 531 and 535 were the first Tektronix scopes to accept plug-ins.<br />
It was [[introduced in 1954|introduced in March 1954]] simultaneously with the Type 535,<br />
and [[introduced in 1959|superseded in 1959]] by the Type 531A,<br />
which has more convenient controls and a slightly faster (15 MHz) vertical amplifier.<br />
<br />
In serial numbers 101 to 7600, the 531's L-C [[delay line]] is in the middle of the vertical amplifier. <br />
In serial numbers 7601 and up, the 531's delay line is between the vertical amplifier and the CRT.<br />
This change was the result of [[John Kobbe]]'s insight that if the far end of the delay line was an open circuit (which the CRT approximates),<br />
the reflected wave could be absorbed at the source end.<br />
This "single termination" approach made it possible to do away with the input chassis.<br />
All subsequent Tek scopes with a lumped-constant delay line used this topology.<br />
<br />
There is also a rack-mount version, Types RM31 and RM31A.<br />
They have a sliding chassis so that the scope can be serviced without removing it from a rack. <br />
<br />
The [[532]] is similar to the 531, but designed to be more reliable at the expense of slower risetime.<br />
The [[541]] is mostly the same as the 531, but has a [[distributed amplifier|distributed vertical amplifier]] <br />
for 30 MHz bandwidth, and a different CRT.<br />
<br />
{{BeginSpecs}}<br />
{{SpecGroup | 531 SN 101-7600}}<br />
{{Spec | Bandwidth | DC to 10 MHz (≤ 3 dB) with [[A|Type A plug-in]] }}<br />
{{Spec | Rise time | 0.035 μs }}<br />
{{SpecGroup | 531 SN 7601 up & 531A}}<br />
{{Spec | Bandwidth | DC to 15 MHz (≤ 3 dB) with [[K|Type K plug-in]] }}<br />
{{Spec | Rise time | 0.024 μs }}<br />
{{SpecGroup | all}}<br />
{{Spec | Line Voltage | 108/115/122/216/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz. }}<br />
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}<br />
{{Spec | Power Consumption | 475W with plug-in }}<br />
{{Spec | Cooling | AC Fan }}<br />
{{Spec | Trigger Modes | AC/DC/AC LF Reject, and HF Sync}}<br />
{{Spec | Anode Potential | 10 kV (relative to cathode)}}<br />
{{Spec | Screen Area | 6 cm × 10 cm}}<br />
{{Spec | Construction | Aluminum alloy chassis. Anodized front panel}}<br />
{{Spec | Weight| 61,5 lbs / 27,8 kg }}<br />
{{EndSpecs}}<br />
<br />
==Links==<br />
{{Documents|Link=531}}<br />
{{Documents|Link=531A}}<br />
<br />
==Pictures==<br />
===531===<br />
<gallery><br />
531_early_1.jpg | early 531 with [[C|Type 53C]]<br />
Tek 531 brown 1.jpg | Brown-era 531 with [[CA|Type CA]]<br />
Tek 531 brown 2.jpg | Brown-era 531 with [[CA|Type CA]]<br />
Tek 531 brown 3.jpg | Brown-era 531 Rear<br />
</gallery><br />
<br />
===531A===<br />
<gallery><br />
Tek 531a g front.jpg<br />
Tek 531a trace.jpg<br />
Tek 531a on cart.JPG | 531A on [[202]] cart<br />
Tek 531a on cart.jpg | 531A on [[500]]/[[53]]cart<br />
Tek 531a 34 pr.jpg | 531A Overwiev<br />
Tek 531a front.jpg | 531A Front<br />
Tek 531a right top.jpg | 531A Timebase ciruit<br />
Tek 531a right2.jpg | 531A Power supply<br />
Tek 531a right 3.jpg | 531A Rectifier board<br />
Tek 531a right.jpg | 531A Inside left<br />
Tek 531a left close.jpg | 531A Vertical amplifier<br />
Tek 531a left.jpg | 531A Inside right<br />
Tek 531a manual compartment.jpg | manual compartment<br />
</gallery><br />
<br />
===RM31A===<br />
<gallery><br />
rm31a.jpg | RM31A<br />
</gallery><br />
<br />
==Components==<br />
{{Parts|531}}<br />
{{Parts|531A}}<br />
{{Parts|RM31A}}<br />
<br />
[[Category:500 series scopes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=6197&diff=9070561972024-02-04T17:30:18Z<p>Vintage dave: 6197 resists forming cathode interface layer</p>
<hr />
<div>{{Vacuum Tube<br />
|Type=Pentode<br />
|Number=6197<br />
|EuroNumber=<br />
|RussianNumber=<br />
|Part_nos=154-0146-00<br />
|Description=7.5 W power pentode<br />
|Used_in=516;531;533;535;535A;547;556;75;3A75;<br />
|Designers=<br />
}} with a {{B9A base}}. It is similar to the [[6CL6]] but rated for "on-off control applications involving long periods of operation under cutoff conditions", meaning that its cathode resists forming an interface layer. This is valuable even in always-on locations like the [[535]] vertical amplifier, where an interface layer would reduce low frequency gain.<br />
<br />
==Links==<br />
<br />
* [[tube:6197 | 6197 @ radiomuseum.org]]<br />
* [http://www.tubezone.net/pdf/6197.pdf Data sheet]<br />
<br />
==Used in==<br />
{{Part usage}}<br />
<br />
==Photos==<br />
<gallery><br />
Raytheon 6197.jpg | Raytheon 6197<br />
</gallery><br />
<br />
<br />
[[Category:Pentodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=106&diff=907041062024-02-04T17:23:33Z<p>Vintage dave: 7189 is not "aka" 6bq5 but it has the same pinout</p>
<hr />
<div>{{Instrument Sidebar <br />
|manufacturer=Tektronix<br />
|model=106<br />
|class=Pulse generator<br />
|series=<br />
|summary=Pulse generator<br />
|image=Tek 106 front2.jpg<br />
|caption=Tektronix 106<br />
|introduced=1966<br />
|discontinued=(?)<br />
|designers=Bill Lukens<br />
|manuals=<br />
* [[Media:070-0523-00.pdf|Tektronix 106 Manual]]<br />
* [[Media:Tek 106 irb.pdf|Tektronix 106 Instrument Reference Book]]<br />
* [[Media:Tek 106 design notes.pdf|Possible Tek 106 Design Notes]]<br />
* [[Media:Tek 106 fcp jan 1967.pdf|Tektronix 106 Factory Calibration Procedure, January 1967]]<br />
* [[Media:Tek 106 fcp june 1969.pdf|Tektronix 106 Factory Calibration Procedure, June 1969]]<br />
}}<br />
The '''Tektronix Type 106''' is a square-wave generator [[introduced in 1966]]. It has four outputs:<br />
<br />
* '''Fast Rise +Output:''' 500 mV into 50 Ω load, positive-going pulse, 1 ns rise time, 50 Ω output impedance, [[GR-874 connector]]<br />
* '''Fast Rise −Output:''' 500 mV into 50 Ω load, negative-going pulse, 1 ns rise time, 50 Ω output impedance, GR-874 connector<br />
* '''High Amplitude Output:''' 12 V into 50 Ω load, 12 ns rise time, 600 Ω output impedance, GR-874 connector<br />
* '''Trigger Output:''' 100 mV into 50 Ω load, 50 ns rise time, 150 Ω output impedance, [[BNC connector]]<br />
<br />
The 1 ns rise-time outputs are generated using diodes to clip a high amplitude signal. In units with serial numbers less than 1190, GaAs diodes were used for clipping. <br />
After serial number 1190, silicon diodes were used.<br />
<br />
The high amplitude output stage of the 106 is made of four [[7189A]] tubes in parallel. <br />
With moderate effort, the socket wiring can be made compatible with the [[7189]] and [[6BQ5]].<br />
<br />
==Links==<br />
* [https://www.youtube.com/watch?v=8RCoTXdgZts Zenwizard Studios - Type 106 Rebuild]<br />
* [https://www.youtube.com/watch?v=ZmOtKnk-oGY Zenwizard Studios - Power Supply Specific Information]<br />
{{Documents|Link=106}}<br />
<br />
==Pictures==<br />
<gallery><br />
Tek 106 front.jpg|Front<br />
Tek 106 front2.jpg<br />
Tek106-outputs.jpg | Outputs<br />
Tek 106 rear.jpg|Rear<br />
106 sch.png|Schematic<br />
106 sidiode.png|Silicon Diode Conversion<br />
Tek 106 on 2235.jpg|106 pulse on [[2235]]<br />
Tek 106 rise.jpg|106 pulse on [[567]] with [[S4]] measuring 600 ps risetime<br />
Tek 106 ps.jpg<br />
Tek106-power-supply-with-refdes.jpg|Power Supply with Component Locations<br />
Tek 106 thermalswitch.jpg<br />
Tek 106 clipperdiodes.jpg<br />
Tek 106 clippers.jpg<br />
Tek 106 bottom.jpg<br />
Tek 106 right.jpg<br />
Tek 106 top.jpg<br />
</gallery><br />
<br />
[[Category:Pulse generators]]<br />
[[Category:GR874]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=547&diff=907025472024-02-03T01:48:50Z<p>Vintage dave: C808 high DF self-heats and causes HV thermal runaway</p>
<hr />
<div>{{Oscilloscope Sidebar <br />
|manufacturer=Tektronix <br />
|model=547 <br />
|summary=50 MHz oscilloscope <br />
|image=Tek 547 D-Alt-Trace.jpeg<br />
|caption=Tektronix 547 with [[1A1]] plugin, in ALT Delayed Trigger <br />
|introduced=1964 <br />
|discontinued=1975 <br />
|designers=Bob Rullman;Keith Taylor;John Gates;Gene Kauffman;George Smith<br />
|series=500-series scopes<br />
|manuals=<br />
* [[Media:070-0398-00.pdf|Tektronix 547/RM547 Manual]] <small>070-0398-00, plus "547 Notes"</small> (OCR)<br />
* [[Media:Tek_547_544_546_tech_instr_and_training.pdf|Tektronix 544/546/547 Technical Instruction and Training]] (OCR)<br />
* [[Media:Tek 547 fcp.pdf|Tektronix 547 Factory Calibration Procedure]]<br />
* [[Media:Tek 547 cal procedure.pdf]]<br />
<small><br />
'''Alternate versions'''<br />
* [https://bama.edebris.com/download/tek/547/547.djvu Tektronix 547 Manual] (DjVu @ BAMA)<br />
* [[Media:070-0398-00 (2).pdf|Tektronix 547 Manual 070-0398-00]]<br />
</small><br />
<small><br />
'''Modifications'''<br />
* [[Media:Tek 547 mods.pdf|Tektronix 547 Modifications]]<br />
* [[Media:050-0479-01.pdf|Disconnect Diode 547/R547 Serials 100-12479]] Tek Part [[050-0479-01]]<br />
</small><br />
}}<br />
The '''Tektronix 547''' is a 50 MHz scope that takes [[letter-series and 1-series plug-ins]]. <br />
<br />
It has two identical timebases and, when used with the [[1A1]], [[1A2]], or [[1A4]], <br />
has the ability to display one input with one time scale and another input with a different time scale. <br />
The effect is similar to a [[dual-beam scopes|dual-beam scope]] <br />
assuming that the input signals are repetitive. <br />
This "Sweep Switching" feature differentiates the 547 from the [[546]].<br />
<br />
There is also a rackmount version, the RM547 or R547. <br />
<br />
The program manager for the development of the Tektronix [[544]], [[546]], and 547 was [[Bob Rullman]].<br />
The 547 vertical amplifier was designed by [[Keith Taylor]].<br />
<br />
{{BeginSpecs}}<br />
{{Spec | Bandwidth | DC to 50 MHz (−3 dB) with fast plug-ins ([[1A1]], [[1A2]], [[1A4]], [[1A5]]) }}<br />
{{Spec | Rise time | 7 ns with [[1A1]] }}<br />
{{Spec | Sweep Rates | 100 ns/div to 5 s/div}}<br />
{{Spec | External Horizontal Input | 100 mV/cm to 10 V/cm, DC to 400 kHz}}<br />
{{Spec | CRT | [[T5470]] (154-0478-00 standard), 10 kV acceleration, 6x10 cm viewing area }}<br />
{{Spec | Calibrator | ~1 kHz, 200 μV<sub>p-p</sub> to 100 V<sub>p-p</sub> }}<br />
{{Spec | Power | 90-136 V or 180-272 V, selected via primary voltage selector (inside cabinet) and voltage range selector (on rear panel), 50/60/400 Hz, 510 W, AC Fan }}<br />
{{EndSpecs}}<br />
<br />
==Internals==<br />
===Triggering===<br />
The 'A' and 'B' triggers are based on a 10 mA [[tunnel diodes|tunnel diode]].<br />
Up to serial number 11889, it uses a [[TD253]].<br />
From 11890 onward, it uses a [[152-0140-01]].<br />
<br />
===HV Transformer===<br />
A common problem with 547s is the [[HV transformers|HV transformer]]. <br />
Rather than potting the HV transformer in wax, as was done up to that point, the [[120-0308-00|547's HV transformer]] was potted in epoxy.<br />
Unfortunately, this epoxy turned out to absorb moisture over time, particularly when used in humid climates.<br />
The moisture causes increased losses in the transformer. <br />
<br />
Excessive losses require the regulator to drive the [[6AU5]] input oscillator tube (V800) harder. <br />
Eventually, the drive circuit cannot supply enough power to keep the supply in regulation.<br />
The usual solution is to scavenge a replacement transformer from another scope.<br />
As a labor of love, hobbyists have been known to rebuild the HV transformers.<br />
This is discussed from time to time on the groups.io (formerly Yahoo) TekScopes forum.<br />
<br />
Bernie Schroder has found that the HV transformer degeneration can be slowed considerably by keeping the HV module cool and dry. <br />
The mod he was taught by [[Jim Willams]] involves replacing the [[5642]] tube rectifiers with NTE517 diodes to reduce the load on the regulator circuit by about 1 Watt by eliminating the filaments.<br />
However, this can force the regulator past its design limit and result in lack of regulation, until the transformer heats up and more power is required due to losses. <br />
<br />
After changing to semiconductor diodes, it will be seen that grid pin 7 of V814 will be about 0 volts (fully on, <br />
with no swing to regulate) in an attempt to force its anode (pin 6) to about +55 V, which is the screen input of the 6AU5 (pin 8). <br />
<br />
One way to remedy this is to replace the anode resistor coming off pin 6 of V814 (R803) from 56 kΩ to 82 kΩ. <br />
Doing so changes the grid voltage on pin 7 of V814 to a comfortable −0.8 V at switch-on. <br />
<br />
Again, this becomes more negative as the losses inside the transformer increase, but not by much if the transformer is healthy.<br />
<br />
A second path to thermal runaway on early serial numbers is C808, which resonates the transformer primary winding. Tek used a Sprague 160P DiFilm Black Beauty. In the 2020's, 160P's are exhibiting high Dissipation Factor when warm, enough to self-heat in this case. Replace with any modern capacitor.<br />
<br />
===Vertical Amplifier===<br />
The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in connector to the CRT vertical deflection plates. <br />
There is one tube in the vertical signal path, a [[12AT7]] acting as a unity-gain buffer between the plug-in connector and the vertical amplifier.<br />
<br />
====Spoiler Switch====<br />
The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's vertical signal path<br />
when certain relatively modern plug-ins are used, such as the [[1A1]], [[1A2]], [[1A4]], and [[1A5]].<br />
<br />
Those plug-ins have a small hole to the left of the plug-in to mainframe connector, so they can be fully inserted without pressing the spoiler switch.<br />
(Spectrum analyzer plug-in Types [[1L30]] and [[1L40]] have the hole too but for no reason since their vertical output is low frequency.)<br />
<br />
* [[Media:Spoiler switch rationale from Tek 547 544 546 tech instr and training.pdf|Spoiler switch explanation excerpted from Tek 547 544 546 Technical Instruction and Training]]<br />
* [[Media:Spoiler switch rationale from Tek 547 notes.pdf|Spoiler switch explanation excerpted from Tek 547 Notes]]<br />
<br />
====Delay Line====<br />
There is a 170 nanosecond [[delay line]] between the first and second gain stages.<br />
<br />
===Power Supply ===<br />
<br />
The 547's power supply provides regulated outputs of −150 V, +100 V, +225 V, and +350 V, plus a +325 V unregulated output for the CRT HV oscillator.<br />
<br />
Multiple secondary windings feed diodes for rectification for different voltages, using both center-tap and bridge configurations. <br />
The regulator section uses no transistors, only tubes. There are multiple 6.3 V secondary outputs for heaters, some elevated to different voltage levels <br />
based on the section/tube that is supplied, in order to keep the heater-to-cathode voltage level within limits.<br />
<br />
As is common in many Tektronix scopes, all regulated voltages are referred to the negative regulated rail (−150 V in this case) by fixed low-tolerance dividers.<br />
Only the −150 V voltage is trimmed; its reference is a [[OG3]] VR tube.<br />
A [[12AX7]] is used as the comparator and two [[6CW5]] in parallel are used as series pass tubes.<br />
A [[6AU6]] is used as an error amplifier. <br />
Most other power supply sections in the 547 replicate the same basic design, except slight changes in tubes used: <br />
The +225 V and +100 V regulators employ a [[6080]] as the pass element, and +350 uses a [[6CW5]]. <br />
<br />
The plate voltage delay circuit is similar to that found in many may other Tek scopes of the same era. <br />
Heater voltage is applied to all tubes immediately when the power switch is turned on.<br />
A [[6N030T|6N030T delay tube (P/N 148-0021-00)]] controls a relay that switches plate supply voltages on only after the tubes are warmed up.<br />
<br />
==Links==<br />
<br />
* [https://lazyelectrons.wordpress.com/2018/07/06/tektronix-547-oscilloscope-restoration 547 Restoration with video]<br />
* Tek 547 in "Reading Jim Williams" blog: [http://readingjimwilliams.blogspot.com/2011/10/scope-sunday-13.html Scope Sunday 13] and [http://readingjimwilliams.blogspot.com/2012/02/vintage-scopes-are-better-part-1.html Vintage Scopes are Better, pt.1]<br />
* "MightyOhm" blog: [http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ Jim Williams workbench] <br />
* [http://www.tek.com/blog/comparing-apollo-era-workhorse-today%E2%80%99s-bench-scope Comparing an Apollo Era Workhorse to Today’s Bench Scope] @ tek.com<br />
* Eiki Martinson: [http://eikimartinson.com/archives/41-Tektronix-547-Oscilloscopemdash;Getting-an-Old-Soldier-Back-in-the-Fight.html Tektronix 547 Oscilloscope—Getting an Old Soldier Back in the Fight]<br />
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/547.htm Tek 547 page @ amplifier.cd]<br />
* [http://www.ebay.com/gds/The-Tektronix-547-Oscilloscope-Magic-in-the-Box-/10000000000725321/g.html The Tektronix 547 Oscilloscope - Magic in the Box]<br />
* [http://www.thevalvepage.com/testeq/tek/547/547.htm J.Evans's 547 page]<br />
<br />
==Common Problems==<br />
* See [[547/Repairs]]<br />
<br />
==Pictures==<br />
===547===<br />
<gallery><br />
Tek 547 trace.jpg | 547 with [[1A2]]<br />
Tek 547 1a2 new.jpg|547 with [[1A2]]<br />
Tek 547.jpg|Front view<br />
Tek 547 eng.jpg|547 serial "ENG B 23"<br />
Tek 547 eng2.jpg|547 serial "ENG B 23"<br />
Tek 547 ampex front.jpg<br />
Tek_547_Delayed_Trigger1.JPG | Tek 547 Delayed Trigger & ALT Sweep<br />
Tek_547_Delayed_Trigger2.jpg | Tek 547 Delayed Trigger & ALT Sweep<br />
Tek 547 trace two sine.jpg|547 trace<br />
Tek 547 1a1 front.jpg|547 with [[1A1]]<br />
Tek_547_4-Trace.jpg | 547 with 1A2 in ALT Sweep Mode<br />
Tek_547_Delayed_Trig.jpg | 547 Delayed Trace<br />
Tek 547 ampex right external.jpg<br />
Tek 547 ampex rear.jpg<br />
Grey face 547.jpg|Gray 547<br />
Tek 547 rear close.jpg<br />
Tek 547 rear connections.jpg|rear connections<br />
</gallery><br />
===547 Internals===<br />
<gallery><br />
Tek_547-Top.jpeg | Internals - Top<br />
Tek_547-RHS-TBOpen.jpeg | Internals - RHS<br />
Tek_547-RHS.jpeg | Internals - Time Base - RHS<br />
Tek_547-Internal-LHS.jpeg | Internals - LHS<br />
Tek_547-Internal-Bottom.jpeg | Internals - Bottom<br />
Tek_547_HVSection-NoCover.jpg | Tek 547 HV Section and [[5642]]HV Rectifier Tube (Cover removed)<br />
Tek_547_HV_Diodes.jpg | Solid State HV Diode Mod<br />
Tek_547-TunnelDiodes-Trigger.jpg | Tunnel Diodes TD253 and TD3A in a Tek 547 Trigger/ Sweep Section<br />
Tunnel_DIode_1D2_2.2mA.jpg | 2.2 mA Tunnel Diode in 547 Delay Pickoff<br />
Tek_547_Vert_Amp.jpg | Tek 547 Vertical Amplifier. The output transistors are mounted on [[beryllium oxide]] discs.<br />
547_01.JPG|Top<br />
547_02.JPG|Right<br />
547_03.JPG|Left<br />
Tek_547_CRT1.jpg | Tek 547 CRT<br />
Tek_547_CRT2.jpg | Tek 547 CRT Side View<br />
Tek_547_CRT_Def_Plates1.jpg | Tek 547 CRT Deflection Plates & Assembly<br />
Tek_547_CRT_Def_Plates2.jpg | Tek 547 CRT Electron Gun Assembly<br />
Tek_547_Chassis_Without_CRT.jpg | Tek 547 Chassis Without CRT and Plug in<br />
Tek_547_Screen.jpg | Tek 547 Screen Scale <br />
Tek_547_Power-Transformer3.jpg | Tek 547 Main Transformer<br />
Tek_547_Power-Transformer2.jpg | Tek 547 Main Transformer<br />
Tek_547_Power-Transformer1.jpg | Tek 547 Main Transformer<br />
Tek_547_Tubes.jpg | Tek 547 Inside view with Power ON<br />
Tek_547_Transformer.jpg | 547 LV Transformer Connections<br />
Tek_547_Inside_Tubes.jpg | Inside a Tek 547<br />
Tek 547 ampex right internal.jpg<br />
Tek 547 ampex left internal.jpg<br />
</gallery><br />
<br />
=== RM 547===<br />
<gallery><br />
Tek rm547.jpg|RM547<br />
Tek rm547 trace.jpg<br />
Tektronix rm547.jpg<br />
</gallery><br />
<br />
=== Schematics ===<br />
<gallery><br />
Tek-547-trigger a.png|Trigger A<br />
Tek-547 vert amp2.png|Vertical amplifier<br />
</gallery><br />
<br />
==Components==<br />
{{Parts|547}}<br />
<br />
<br />
[[Category:500 series scopes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Amphenol_165_series_connectors&diff=90202Amphenol 165 series connectors2023-12-31T16:57:18Z<p>Vintage dave: Update external link</p>
<hr />
<div>[[File:Amphenol 12p f.jpg|thumb|200px|right|165-12 connector on [[AM503]]]]<br />
[[File:Amphenol 12p m.jpg|thumb|200px|right|165-9 connector on [[P6303]]]]<br />
The '''Amphenol 165 series''' are round, bayonet-locking, MIL-SPEC connectors.<br />
<br />
Some types are used in Tektronix equipment.<br />
<br />
The '''Amphenol 165-15''' is a square-flange panel-mount connector that has nine #20 pin contacts <br />
with a current rating of 7.5 Amperes. The mating cable connector is the '''165-14'''. <br />
The reverse gender models are '''165-16''' and 165-13, respectively. <br />
<br />
''Used in:''<br />
<br />
* cable that connects the [[175]] (165-15) to the [[575]] (165-16)<br />
* cable that connects the [[182]] (165-15) to the [[183]] (165-16)<br />
* connection between the [[P80|P80 probe]] (165-14) and the [[80|Type 80 plugin]] (165-15)<br />
* input connection on [[Q|Type Q transducer / strain gauge amplifier]] (165-15)<br />
* auxiliary power connector on rear of [[565]] (165-16)<br />
* differential probe input on [[1A5]] and [[015-0106-00]] amplifier (165-16)<br />
* [[P6046]] probe (165-13)<br />
* Connector for [[012-0102-00]] remote control (165-13) on rear of [[549]] (J925) & [[564]]B (J950) (165-16)<br />
* Remote control connector on rear of [[R5031]] <br />
* J9034 on rear of [[1481|1480 series]] (165-16)<br />
* [[7000-series remote control connector]] on rear of [[7503]], [[7504]], [[7514]], [[7704]], and [[7904]] (165-16)<br />
* Staircase signal connector (J501) on rear of [[529]] and [[RM529]] (165-16)<br />
<br />
The '''Amphenol 165-12''' square-flange panel-mount connector that has twelve #20 socket contacts with a current rating of 7.5 Amperes. <br />
The mating cable connector is the 165-9.<br />
<br />
''Used in:''<br />
<br />
* current sensor input on the [[AM503]], [[AM5030]] and [[11A16]] (165-12)<br />
* [[A6302]], [[A6302XL]], [[A6303]], [[A6303XL]], [[A6304XL]] and [[A6312]] current probes (165-9)<br />
<br />
==Links==<br />
<br />
* [[Media:Amphenol_165_data_sheet.pdf|Amphenol 165 Data Sheet]]<br />
* [https://www.amphenol-aerospace.com/resources/literature/view/67-and-165-series-miniaturized-standard-connectors-catalog Amphenol 67 and 165 series catalog]<br />
<br />
==Pictures==<br />
<gallery><br />
Tek 175 rear connector.jpg| 165-15 connector on rear of [[175]]<br />
Tek 575 rear connector.JPG| 165-16 connector on rear of [[575]]<br />
Tek 565 j780.jpg | 165-16 auxiliary power connector on rear of [[565]]<br />
Amphenol 12p f.jpg | 165-12 connector on [[AM503]]<br />
Amphenol 12p m.jpg | 165-9 connector on [[P6303]]<br />
Tek 012-0102-00.1.jpg | 165-13 connector on [[012-0102-00]]<br />
</gallery><br />
<br />
<br />
<br />
<br />
[[Category:Low-voltage connectors]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=111&diff=902011112023-12-31T16:20:11Z<p>Vintage dave: Late and early rear view photos were swapped, late has the BNC and early has the UHF</p>
<hr />
<div>{{Instrument Sidebar <br />
|manufacturer=Tektronix<br />
|model=111<br />
|class=Pulse generator<br />
|series=<br />
|summary=Pretrigger Pulse Generator<br />
|image=Tek 111 front.jpeg<br />
|caption=Front View<br />
|introduced=1960<br />
|discontinued=(?)<br />
|designers=<br />
|manuals=<br />
* [[Media:070-252.pdf|Tektronix 111 Manual]] (PDF)<br />
* [https://w140.com/tek_fcp/tek_type_111_factory_cal_proc.pdf Tektronix 111 Factory Calibration Procedure (PDF)]<br />
}}<br />
The '''Tektronix Type 111 Pretrigger Pulse Generator''' produces two pulse signals, one to trigger an oscilloscope sweep and a main output pulse to stimulate the device under test. <br />
<br />
The trigger pulse comes between 30 and 250 nanoseconds before the output pulse; this is controlled by a knob on the 111. This gives adequate time for the oscilloscope to start sweeping so that the leading edge of the input or output signals of the device under test can be viewed. The alternative is to have a [[delay line]] in the signal path, after the trigger pickoff, but delay lines degrade transient performance. Using a pretrigger eliminates the need for a delay line in the vertical signal path and therefore enables accurate high-speed measurements. For a stable display, low jitter of the delay between pretrigger and main pulse is essential.<br />
<br />
{{BeginSpecs}}<br />
{{Spec | Pulse repetition rate | 10 Hz to 100 kHz, or by external trigger }}<br />
{{Spec | Rise time | <500 ps }}<br />
{{Spec | Pre-trigger | 30−250 ns variable with additional calibrated "+1 ns" switch, jitter ≤100 ps }}<br />
{{Spec | Output amplitude | ≥10 V (selectable polarity) into 50 Ω }}<br />
{{EndSpecs}}<br />
<br />
==Internals==<br />
The main output pulse of the Type 111 is produced by an avalanche transistor. <br />
<br />
==Notes==<br />
The Auxiliary Equipment section in the [[N|Type N]] manual says the rise time is 300 ps. The 111 front panel and manual specify <500 ps.<br />
<br />
==Pictures==<br />
<gallery><br />
Tek 111 front.jpg|Front View<br />
Tek_111-Front.jpg | Front<br />
Tek_111_left.jpg|Left Internal View<br />
Tek 111 left internal.jpg|Left Internal View<br />
Tek 111 right.jpg|Right Internal View<br />
Tek 111 right internal.jpg|Right Internal View<br />
Tek_111_rear.jpg|Early serial number rear view<br />
Tek_111-Rear.jpg | Rear<br />
Tek 111 rear2.jpg|Late serial number rear view<br />
Tek 111 schem.gif|Schematic<br />
Tek 110 or 111 and type n diode measure.jpg<br />
Tek type 111 two triggers per pulse 1.jpeg|111 with two triggers per pulse switch<br />
Tek type 111 two triggers per pulse 2.jpeg|111 with two triggers per pulse switch<br />
Tek type 111 two triggers per pulse 3.jpeg|111 with two triggers per pulse switch<br />
</gallery><br />
<br />
[[Category:Pulse generators]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=File:535-545-Manual-Page-3-10-Missing-From-070-198-Scan.pdf&diff=87719File:535-545-Manual-Page-3-10-Missing-From-070-198-Scan.pdf2023-11-07T23:57:47Z<p>Vintage dave: Page 3-10 of 070-198 (Type 535-545 Instruction Manual), missing from the scan hosted here.</p>
<hr />
<div>== Summary ==<br />
Page 3-10 of 070-198 (Type 535-545 Instruction Manual), missing from the scan hosted here.</div>Vintage davehttps://w140.com/tekwiki/index.php?title=5814&diff=8613058142023-10-05T18:55:03Z<p>Vintage dave: D S/N range</p>
<hr />
<div>{{Vacuum Tube<br />
|Type=Double Triode<br />
|Number=5814<br />
|Part_nos=154-0054-00,154-0316-00<br />
|Description=twin medium-μ triode<br />
|Used_in=D;<br />
|Designers=<br />
}}. It is a high-rel version of the [[12AU7]] (ECC82) with increased heater current. <br />
<br />
It has a 12.6 V, 175 mA center-tapped filament and a {{B9A base}}. (The European '''E82CC''' high-rel version of the ECC82 has a 12.6 V, 150 mA center-tapped filament.)<br />
<br />
Tek part number: 154-0054-00 (5814A), 154-0316-00 (5814A?)<br />
<br />
==Used in==<br />
* [[D|Type D]]<br />
* ...<br />
{| class="wikitable"<br />
{{Checkedtubes TableHeader}}<br />
|- <br />
| Type [[D]] Plug-in (V3404,V3454) || 157-0036-00 || 101-3640<br />
|}<br />
<br />
157-0036-00 has been replaced by 157-0049-00 <br />
<br />
{{Tube aging reference}}<br />
<br />
==Links==<br />
<br />
* [http://w140.com/5814.pdf 5814] / [http://w140.com/5814A.pdf 5814A] Datasheet (PDF)<br />
* [[tube:5814.html | 5814]] / [[tube:5814a.html | 5814A]] @ radiomuseum.org<br />
<br />
==Pictures==<br />
<br />
<gallery><br />
Philips 5814a tube.jpg|Philips 5814A<br />
</gallery><br />
<br />
[[Category:Triodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=D&diff=86127D2023-10-05T18:48:47Z<p>Vintage dave: Superseded by 1A6 only; 1A7 is 500kHz vs 2MHz</p>
<hr />
<div>{{Plugin Sidebar <br />
|manufacturer=Tektronix <br />
|series=500-series scopes <br />
|type=Type D<br />
|summary=Differential amplifier<br />
|image=Tek type d front.jpg<br />
|caption=D front view<br />
|introduced=1954<br />
|discontinued=1969<br />
|designers=Rodgers Jenkins<br />
|manuals=<br />
* [[Media:070-228.pdf|Tektronix Type D Manual]] (bad-OCR)<br />
* [[Media:tek_type_d_fcp.pdf|Tektronix Type D Factory Calibration Procedure]] (OCR)<br />
* [[Media:Tek type d cal outline.pdf|Tektronix Type D Calibration Outline]] (OCR)<br />
<!-- * [http://w140.com/tek_fcp/tek_type_d_factory_cal_proc.pdf Cal procedure]<br />
* [http://bama.edebris.com/manuals/tek/d/ Type D manual @ BAMA] --><br />
}}<br />
The '''Tektronix Type D''' is a differential amplifier plug-in for [[500-series scopes]].<br />
It was designed by [[Rodgers Jenkins]].<br />
<br />
Type D was the most sensitive plug-in of the original four.<br />
The bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div to 300 kHz at 1 mV/div.<br />
There are two axes of sensitivity setting: a decade attenuator in front of a gain switch.<br />
This scheme would be reprised in Type [[W]].<br />
<br />
It displays the difference between two input signals, with a common-mode rejection ratio of 10,000. <br />
It has six tubes, on a shock-mounted subchassis to avoid microphonics.<br />
<br />
Along with Types [[A]], [[B]], and [[C]], Type D was introduced with the [[531]] and [[535]] in [[introduced in 1954|1954]].<br />
<br />
At the time it was called Type 53D.<br />
It was briefly renamed 53D/54D in 1955 with the introduction of the [[541]] and [[545]]. This quickly changed to 53/54D, and finally shortened to just "D" in 1959 with the introduction of the 5xxA scopes.<br />
Its final year in the catalog was 1968; it had been superseded by Type [[1A6]].<br />
<br />
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years.<br />
[[B]], [[D]], and [[G]] are next at 15 years.<br />
<br />
[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]].<br />
<br />
==Internals==<br />
Instruments below serial number 3462 used a pair of [[5814]] tubes at the input; later production used [[12AU7]]'s.<br />
These two tube types have different heater currents, and because the heaters are series-wired, you cannot switch from one type to the other without circuit modification.<br />
<br />
{{BeginSpecs}}<br />
{{Spec | Deflection | 1 mV/Div to 50 V/Div in 1–2–5-10-20-50 sequence and 1-10-100-1000 sequence }}<br />
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}<br />
{{Spec | Bandwidth | 2 MHz with MV/CM MULTIPLIER set to 50; 300kHz with MV/CM MULTIPLIER set to 1 }}<br />
{{Spec | CMRR | 10000:1 with MILLIVOLTS/CM set to 1, 1000:1 otherwise }}<br />
{{Spec | Signal ranges | }}<br />
{| class="wikitable" border=1 style="margin-left: 8em;" |<br />
!Range<br />
! Common mode dynamic range*<br />
|-<br />
| MILLIVOLTS/CM = 1 || ±2.5 V<br />
|-<br />
| MILLIVOLTS/CM = 10 || ±25 V<br />
|-<br />
| MILLIVOLTS/CM = 100 || ±250 V<br />
|-<br />
| MILLIVOLTS/CM = 1000 || ±500 V<br />
|-<br />
|}<br />
* In practice, Type D behaves well up to about +/–15V if the CM signal is either a brief excursion or a constant. If the CM varies slowly, DC shift in the input tubes will degrade CMRR.<br />
{{EndSpecs}}<br />
<br />
==Pictures==<br />
<br />
<gallery><br />
D.jpeg<br />
D 1.JPG|Front<br />
D 1.JPG.JPG| Chassis<br />
D 3.JPG| Rubber support for elimination of microphonics<br />
D 4.JPG| Chassis bottom<br />
Tek d early schem.png|Early Schematic<br />
Tek d late schem.png|Late Schematic<br />
Tek d late attenuators.png|Late Attenuators<br />
Tek type d front.jpg|Front View (vertical position knob not original)<br />
</gallery><br />
<br />
{{Parts|D}}<br />
<br />
[[Category:500 series plugins]]<br />
[[Category:Differential amplifiers]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Talk:180&diff=82499Talk:1802023-07-02T17:02:40Z<p>Vintage dave: 180-S1</p>
<hr />
<div>Type 180-S1's crystal is enclosed in a temperature-controlled oven while Type 180's crystal is untrimmed.</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Connie_Wilson&diff=81806Connie Wilson2023-05-25T14:36:35Z<p>Vintage dave: Tek always called products "Type" not "Model"</p>
<hr />
<div>[[File:Connie Wilson.jpg|thumb|250px|right|Connie Wilson]]<br />
{{Person<br />
|Names=Connie Wilson <br />
|Birth date=<br />
|Birth place=Portland, OR<br />
|Death date=July 23, 1986<br />
|Death place=<br />
|Countries=USA<br />
|Affiliations=Tektronix;<br />
|Wikidata id=<br />
}} joined the Gun Fabrication group of Tek's CRT Production in June 1957. <br />
<br />
In the early 1950s, she had planned to get a biology degree at Portland State College and work as a laboratory technician. <br />
She lived at home and worked nights and weekends to pay for her education. But just as she was about to finish up, her parents moved to Missouri. <br />
With no place to live, Connie quit school and went to work. After working other jobs for a couple of years, in 1957 she landed a job at Tektronix’ CRT Production’s Gun Fabrication group.<br />
<br />
Having no engineering degree nor even a bachelor's degree, she went on to become project leader of the group responsible for designing CRTs and in the process designed the CRT for the Type 540 series of oscilloscopes and for the Type 556 dual-beam oscilloscope. <br />
<br />
In 1964, Connie helped design the Type 545-B and 547 oscilloscopes that became industry standards.<br />
<br />
According to [[Media:TekTalk 1966 Fall.pdf|TekTalk Fall 1966]], she <br />
<blockquote><br />
[...] assisted in the design of the [[T5032]] tube for the [[561A]] oscilloscope. <br />
<br />
The [[T5033]] tube for the [[506]] was the first tube she designed as a junior engineer.<br />
<br />
As an engineer, she designed the [[T5470]] CRT for the 540 series, the [[T5290]] for the [[529|529 television waveform monitor]] and the [[T5560]] for the [[556|556 dual-beam oscilloscope]].<br />
</blockquote><br />
<br />
Connie left Tektronix in 1974 to coach volleyball at Clackamas Community College and run a trailer park she had bought.<br />
<br />
==Links==<br />
* [https://vintagetek.org/connie-wilson/ Connie Wilson] @ vintagetek.org<br />
* [https://www.tek.com/blog/lets-celebrate-international-women-engineering-day-and-teks-own-connie-wilson Let’s Celebrate International Women in Engineering Day and Tek’s Own Connie Wilson] @ tek.com<br />
* [https://news.tektronix.com/2018-06-21-Tektronix-Celebrates-International-Women-in-Engineering-Day-By-Recognizing-Former-Engineer-Connie-Wilson Tektronix Establishes Award Program in Connie Wilson's Honor]<br />
<br />
{{Designer|Connie Wilson}}<br />
{{Patents|Connie Wilson}}<br />
<br />
<br />
<gallery><br />
Connie Wilson 1966.jpg | Connie Wilson, from TekTalk Fall 1966<br />
Connie Wilson.jpg<br />
</gallery><br />
<br />
<br />
[[Category:Tektronix people]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Talk:134&diff=80190Talk:1342023-02-13T19:26:56Z<p>Vintage dave: LF COMP not selected by probe model switch</p>
<hr />
<div>LOW FREQUENCY COMPENSATION<br />
<br />
There's only one adjustment, but you have to set it differently for P6019/P6021 and P6020/P6022. There's a lever switch on the front to pick the probe model, why doesn't it select LF COMP as well? This strikes me as an inexcusable gaffe. How did they miss it?</div>Vintage davehttps://w140.com/tekwiki/index.php?title=547/Repairs&diff=74972547/Repairs2022-05-31T16:14:45Z<p>Vintage dave: Add my 547 repair history</p>
<hr />
<div><br />
==Power supply Electrolytic Capacitors==<br />
Depending on the age of the instrument, the main electrolytic capacitors may be dry or leaky.<br />
You may want to test and replace or reform them (if you believe in doing so).<br />
<br />
There is no slow power up option here as the plate voltage for all the tubes are controlled by a time [[delay relay]]<br />
<br />
You can remove the time delay tube and power up the instrument with just heater supply to tubes.<br />
<br />
== [[2N2207]] Tin Whisker ==<br />
[[2N2207]] used in various sections can fail due to Tin whisker. Easy way to identify is by tracking the AC signal as per schematic and spot the offending transistor, where the signal will disappear. <br />
<br />
== Tunnel Diode ==<br />
<br />
547 uses [[tunnel diodes]] in the Timebase for generating trigger and delayed trigger. <br />
They can also fail. Tunnel diodes are sensitive, be careful while soldering them and use proper heat sinking to avoid damage to the Tunnel diodes. <br />
A failed tunnel in the trigger will result in sweep free running in auto mode and unable to lock. Normal mode sweep will not trigger. <br />
<br />
== HV Transformer ==<br />
Refer to [[547]] Main page for details. <br />
<br />
==General Troubleshooting==<br />
<br />
Refer to service manual first for the overview of the equipment and general troubleshooting procedure with specific component level troubleshooting chart.<br />
<br />
If you are new to the instrument, ensure that the scope is in the right settings. For example, trigger (in Auto), V and H positions, focus/intensity at the at correct levels and Time base selector switch is selected for right time base.<br />
<br />
At a high level the process is to start with power supplies, and are ensure all power supply voltages are within the specified tolerance.<br />
There are a dedicated power supply test point ceramic strip on the chassis. Refer service manual. <br />
<br />
#Isolate the problem to a specific section first, for example Power supply, HV, Vertical, Horizontal, Trigger.<br />
#There are DC voltages marked in every section of the schematic. Set the oscilloscope to the specific settings as mentioned in the service manual and verify all DC bias voltages at the schematic section in question are matching service manual. Once again remember to keep the scope in the specific settings as specified in the service manual. The failing section of the schematic can be easily spotted by a missing or incorrect DC bias value, mostly due to shorted or open components. <br />
# There are AC waveforms shown in the schematic for every block of the schematic. Verify and confirm the same with another scope to isolate the failing component/section. <br />
# Service manual explains the schematic in detail, refer it for a detailed understanding of the section you are troubleshooting.<br />
# You can inject external H-signal to isolate sweep generator and H- AMP section. Set the scope to external H input and apply external H signal to verify the H-Amp is working. This will help you narrow down the problem between H-Amp and Sweep/Time Base.<br />
<br />
==David Wise's 547 Repair History==<br />
<br />
MY TEKTRONIX 547 OSCILLOSCOPE REPAIRS<br/><br />
January 2021<br/><br />
David Wise<br/><br />
<br />
S/N 4369<br />
<br />
Acquired around 2000 from Bob in South Bend WA<br/><br />
Came with 1A4, 1A5, 1A7 #257<br />
<br />
Had lossy epoxy HV transformer which failed.<br />
Rewound by Bill Schell. (Chuck Harris says Bill did layer wind on<br />
a spindle with #32 instead of universal wind with #38 like Tek,<br />
but mine looks like universal.)<br />
I still have 5642's, and the filament loops fit easily.<br />
<br />
MODS APPLIED<br />
<br />
Around 2000<br />
<br />
M11722 (5680) Time Base 'A' Unblanking Circuit Resistor Added To Assure 'B' Trace Is Brighter Than 'A' Trace At Some Sweep Speeds<br/><br />
* Add R377 1K, see manual page 163 'A' Sweep Generator<br/><br />
* I also put a cap across it like Tek should have<br />
<br />
M11808 (5680) Horizontal Amplifier RC Network Added To Protect CRT Phosphor From Possible 'Turn-On-Flash' Burns<br />
* Cap yanks beam to side during power on<br />
* Add D561, C562, R562<br />
<br />
M11809 (S/N 5830) to limit 6AU5 screen voltage to +125V.<br />
* Add D803, D804, R804<br />
<br />
M12258 (S/N 6380) my field version: teepee a regular diode in series with D693 to prevent forward bias.<br />
<br />
PARTIAL<br />
M14194 (S/N 10730) Vertical Amplifier Components Changed to Improve 1-15kHz Frequency Response<br />
* They shortened the existing time constants and added a new long time constant<br />
* Part of the mod changes R1077 from 16K fixed to 30K variable.<br />
* I hand-selected a fixed resistor (24K) shunted across original R1077.<br />
* Did not do other parts:<br />
** Change C1077 value<br />
** Change R1126 value<br />
** Add R1091/C1091<br />
<br />
M14860 (S/N 11270) Vertical Amplifier Diodes Added To Protect +100V Supply<br />
* Add D1114 in series with D1109<br />
<br />
December 2017<br />
<br />
SYMPTOM 201712: B Trigger: Auto works when Level is cranked one way but not the other.<br />
Effect reverses when you flip the Slope switch.<br/><br />
CAUSE: D45 (B Trigger tunnel diode) Ip decreased from 10mA nominal to 6mA.<br/><br />
I think that a turn-off transient from the Auto multivibrator was retriggering D45 which in turn retriggered the Auto multi and inhibited bright-line Auto.<br/><br />
ACTION: Original part is 152-0154 i.e. TD253, which is Germanium. I replaced it with a GaAs Russian surplus 3I306L.<br/><br />
FIXED. Seems fine even though the TD is slower(?) and has higher Vv and Vf.<br />
<br />
SYMPTOM 2021: HV transformer runaway!<br/><br />
ACTION: Bake in instrument<br/><br />
FIXED. Moisture ingress due to long sit in cold humid basement?<br />
<br />
SYMPTOM 20220520: Jitter in fast B sweep, triggering not as good as A<br/><br />
I figure it's that Russian tunnel diode and I didn't notice before<br/><br />
WILL NOT FIX<br />
<br />
SYMPTOM 20220520: Poor vertical HF response: -3dB at 35MHz not 50MHz; 10ns risetime<br/><br />
CONTEXT: Using 8640B for f, 067-0521-01 for t<br/><br />
ACTIONS:<br/><br />
* Re-seat transistors, no effect<br />
* Re-seat plugin, some effect<br />
* Adjust per Table 5-8, some effect<br/><br />
NOTE: L1157 has no effect, always slight wrinkles always in same spots<br/><br />
NOTE: C1029 subtle effect but canceling bump also increases risetime slightly<br/><br />
ACTION: Accidentally leaned on the delay line, DRASTIC EFFECT, flexed it, more effect.<br/><br />
* Flexed it more, no further effect.<br/><br />
* Now significant rolloff probably due to previous adjustment attempt.<br/><br />
* But now able to flatten by adjusting Table 5-8 R's and C's.<br/><br />
FIXED. 7ns risetime, 45MHz<br/><br />
WHAT DID I DO?<br/><br />
WATCH delay line, is it sick?<br />
<br />
SYMPTOM 20220520: Crumbling carry handle<br/><br />
NOTE: Crumbling handles are on a 535A rail, probably 381-0204-00 (blue leatherette)<br/><br />
I thought I had new ones but where are they?<br/><br />
ACTION: Bought complete 381-0217-00 top rail with vinyl handles 367-0037-00 from eBay seller<br/><br />
NOTE: 6" grip with captive square rings<br/><br />
NOTE: Earlier 535A rails are 381-0121-00 (black leather) and 381-0149-00 (blue leather)<br/><br />
NOTE: 547 handle also used on late 503<br />
<br />
SYMPTOM 20220526: Flickering trace first few minutes after cold power-on<br/><br />
CANNOT REPRODUCE 20220528<br/><br />
HV Test Point<br/><br />
* -1900V on Fluke 825A with Fluke 80K-40 (1000Meg), raster<br/><br />
* -1898V on 067-0543-99 (100Meg), beam off<br/><br />
INTENSITY string<br/><br />
* -2015V on 067-0543-99, beam off<br />
<br />
TODO:<br/><br />
M14928 (S/N 12110) Swap D672A-D for stronger, 1N4004/1N5060/1N5404.<br/><br />
M15145 (11890) Resistor Changed To Ensure Operation Of Vertical Position Neon<br/><br />
* R1187 was 330K CC now 301K 1%. I will simply select a carbon film part.<br/><br />
M12876 (6300) Motor Base Changed To Improve Ground Connection<br/><br />
* Just make sure we have a solid equipment ground<br/><br />
<br />
MAYBE:<br/><br />
M11122 (S/N 4750) Vertical Amplifier Gain Potentiometer Range Increased<br/><br />
M11707 (S/N 5680) Vertical Amplifier Output Transistors Changed To Reduce Failures<br/><br />
* Look for 153-0548-00<br />
M12460 (S/N 6730) Vertical Amplifier Input Tube And DC Balance Potentiometer Replaced To Improve Vertical Amplifier Balance<br/><br />
M14194 (S/N 10730) Vertical Amplifier Components Changed To Improve 1-15kHz Frequency Response<br/><br />
M13839 (8420) 'B' Sweep Chassis Wire Modification Incorporated To Eliminate Sweep Free-Running<br/><br />
* Wire strap to Q44.C relocated, and C44/C45 leads shortened<br />
<br />
WILL NOT DO:<br/><br />
M12027 (6740) 040-0549-00 Trigger Circuits Rewired To Improve Stability<br/><br />
M14339/M15344 050-0479-01 Disconnect Diode Replacement<br/><br />
* 1972<br />
* There's a mystery here. New Q286 is 151-0277-00. Manual says RCA 38520 and there's NO info on the web.<br />
* Common Design 1982 says 151-0277-00 is 2N3933 830MHz TO-72 Do Not Use.<br />
* NJSemi 2N3933 datasheet says 0.55pF, VHF/UHF amplifier.<br />
* 7L5 military manual TM11-6625-2759-14&P says 151-0230-00 is RCA 38520 but Common Design says it's 2SC1260 1GHz 0.7pF<br />
* New D286 152-0185-00 "replaceable by 1N4152"<br />
* Common Design says Do Not Use, use 151-0141-02<br />
* New D291 is 152-0165-00, Common Design says 1N3579, 10pA at 3V, no info on web.<br />
* 556 Lecture Notes says it's a selected 1N3579.<br />
* D291 protects D286 from excessive reverse voltage<br />
* D90 (same as D291) added S/N 3130 M10510 "to protect disconnect diode".<br />
* D86/D286 were originally Tek-made GaAs and needed protection.<br />
* RA1092, no info except small-signal diode<br />
* Made by Microsemi and Freescale. It seems to me that maybe a 1N4152 doesn't need protection.<br />
M12463 (11890) Tunnel Diodes Replaced To Increase Power Rating<br />
* D45/D245 was 152-0154-00 now 152-0140-01<br />
* D45 already replaced with Russian 3I306L<br />
M13384 (7960) Sweep Trigger Generator Amplifier Tubes Changed To Checked/Aged/Balanced Tubes<br/><br />
050-0479-01 (12480) Disconnect Diode Replacement<br/><br />
M11266 (5310) [timing caps drift due to temperature cycling]<br/><br />
M11517 (5480) [timing resistors]<br/><br />
M13653 (8290) [timing resistors]<br/><br />
M14095 (10260) [timing resistors]<br/><br />
050-0473-00 (12471) Sweep Steering Diodes<br/><br />
M11212 (5130) [mag gain resistor]<br/><br />
M12856 (10200) [calibrator resistors]<br/><br />
M12130 (6730) [anti-slip feet]<br/><br />
M11191 (8630) [standardize zener part numbers]<br/><br />
M15322 (12800) [cabinet latches]<br />
<br />
[[Category:Instrument repair reports]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=1A5/Repairs&diff=749711A5/Repairs2022-05-31T14:33:31Z<p>Vintage dave: formatting</p>
<hr />
<div>Design mistake. The UNCAL lamp is powered by "+100V DCPLD A" which shifts the trace<br />
about 0.1 division. It should be powered from the basic +100V rail.<br />
<br />
Serial Number B124386<br />
<br />
SYMPTOM: Vc has long asymptotic tail<br/><br />
DATE: 20220520<br/><br />
NOTE: Old symptom, just noticed now<br/><br />
CAUSE: Leakage in C114, 1uF 25V NP aluminum electrolytic<br/><br />
ACTION: Replace with 1uF 25V X7R ceramic a la Type W<br/><br />
FIXED<br />
<br />
SYMPTOM: Clear V/CM knob skirt is cracked and slipping<br/><br />
DATE: 202205<br/><br />
NOTE: Old symptom, just slowly getting worse<br/><br />
NOTE: Part #74 in mechanical diagram, 366-0418-00<br/><br />
ACTION: Super-glue plastic hub to metal hub<br/><br />
OOPS: Super glue dissolved a mark<br/><br />
ACTION: Redraw with Sharpie<br/><br />
FIXED</div>Vintage davehttps://w140.com/tekwiki/index.php?title=1A5/Repairs&diff=749701A5/Repairs2022-05-31T14:26:39Z<p>Vintage dave: Add my 1A5 repair history</p>
<hr />
<div>Design mistake. The UNCAL lamp is powered by "+100V DCPLD A" which shifts the trace<br />
about 0.1 division. It should be powered from the basic +100V rail.<br />
<br />
Serial Number B124386<br />
<br />
SYMPTOM 20220520. Actually old, just noticed now.<br />
Vc has long asymptotic tail.<br />
CAUSE: Leakage in C114, 1uF 25V NP aluminum electrolytic.<br />
ACTION: Replace with 1uF 25V X7R ceramic a la Type W.<br />
FIXED<br />
<br />
SYMPTOM 202205. Old, just slowly getting worse.<br />
Clear V/CM knob skirt is cracked and slipping.<br />
NOTE: Part #74 in mechanical diagram, 366-0418-00.<br />
ACTION: Super-glue plastic hub to metal hub<br />
OOPS: Super glue dissolved a mark<br />
ACTION: Redraw with Sharpie<br />
FIXED</div>Vintage davehttps://w140.com/tekwiki/index.php?title=7233&diff=7496972332022-05-29T18:41:31Z<p>Vintage dave: </p>
<hr />
<div>{{Vacuum Tube<br />
|Type=Triode<br />
|Number=7233<br />
|EuroNumber=<br />
|RussianNumber=<br />
|Part_nos=<br />
|Description=low-mu triode<br />
|Used_in=132;<br />
|Designers=<br />
}} with a {{B9A base}}, intended for use as series regulator in power supplies. Electrically, it is similar to one half of a [[6080]].<br />
<br />
It is used in the [[132]] power supply.<br />
<br />
Tek part number: 154-0307-00<br />
<br />
==Specifications==<br />
* 140 mA max, 7.5 W plate dissipation, -300V to +300V between heater and cathode<br />
* Heater 6.3 V, 1 A<br />
<br />
==Links==<br />
* [[tube:7233|7233 @ radiomuseum.org]]<br />
<br />
<br />
<gallery><br />
154-0307-00.jpeg<br />
</gallery><br />
<br />
[[Category:Triodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=7233&diff=7496872332022-05-29T02:05:00Z<p>Vintage dave: half a 6080</p>
<hr />
<div>{{Vacuum Tube<br />
|Type=Triode<br />
|Number=7233<br />
|EuroNumber=<br />
|RussianNumber=<br />
|Part_nos=<br />
|Description=low-mu triode<br />
|Used_in=132;<br />
|Designers=<br />
}} with a {{B9A base}}, intended for use as series regulator in power supplies. It's similar to one half of a [[6080]].<br />
<br />
It is used in the [[132]] power supply.<br />
<br />
Tek part number: 154-0307-00<br />
<br />
==Specifications==<br />
* 140 mA max, 7.5 W plate dissipation, -300V to +300V between heater and cathode<br />
* Heater 6.3 V, 1 A<br />
<br />
==Links==<br />
* [[tube:7233|7233 @ radiomuseum.org]]<br />
<br />
<br />
<gallery><br />
154-0307-00.jpeg<br />
</gallery><br />
<br />
[[Category:Triodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=6GE8&diff=749676GE82022-05-29T02:03:54Z<p>Vintage dave: power triode</p>
<hr />
<div>[[File:7734.jpg|400px|right]]<br />
{{Vacuum Tube<br />
|Type=Triode/Pentode<br />
|Number=6GE8<br />
|EuroNumber=<br />
|RussianNumber=<br />
|Part_nos=154-0260-00<br />
|Description=triode-pentode combo<br />
|Used_in=125;132<br />
|Designers=<br />
}} with a {{B9A base}}.<br />
<br />
The '''7734''' is the high-rel version.<br />
<br />
It's an unusual tube. Most triode-pentodes contain a small-signal triode. The 7734/6GE8 triode is designed to dissipate some power, typically as the pass element in a linear power supply regulator.<br />
<br />
==Used in==<br />
* [[125]] <br />
* [[132]] <br />
* [[067-0502-00]]<br />
* [[067-0502-01]]<br />
<br />
==Links==<br />
* [[tube:6ge8|6GE8]] / [[tube:7734|7734]] @ radiomuseum.org<br />
<br />
<br />
<br />
[[Category:Triodes]]<br />
[[Category:Pentodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=W/Repairs&diff=74828W/Repairs2022-05-11T21:26:23Z<p>Vintage dave: More formatting. If you can do better, go ahead.</p>
<hr />
<div>==ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416==<br />
<br />
It's common to find a Type W plugin missing its three type 8416 electron tubes.<br />
<br />
The 8416 is the industrial version of the 12DJ8. 8416 and 12DJ8 are crazy-expensive when you can find them at all.<br /><br />
It's possible to modify Type W to use 6DJ8 (the 6V version of 12DJ8), which is expensive but readily available.<br />
<br />
Studying datasheets, I found that under the conditions in Type W, 12AT7 has almost the same gm and rp as 6DJ8.<br /><br />
The 12AT7 is cheap and abundant.<br />
<br />
I have three Type W's. I modded serial number 7465 to use 6DJ8, and 7111 and 2369 to use 12AT7.<br /><br />
In each case, I calibrated before the mod using my three precious 8416's, and again after the mod.<br /><br />
Two instruments failed on bandwidth. (2369 spec is 23MHz, actual is 21MHz. 7111 spec is 26MHz, actual is 25MHz.)<br /><br />
But they did no better with 8416's; performance is equal with 6DJ8 and slightly better with 12AT7.<br />
<br />
The two mods are about equal in difficulty.<br /><br />
The instrument should be calibrated after either mod.<br />
<br />
===1. 6DJ8/6922/ECC88/E88CC/7DJ8/PCC88===<br />
<br />
NOTE: These types are often advertised as identical, but their heater current is different.<br /><br />
You can use any type but you can't mix them.<br /><br />
Adjust the series resistor and current supply for the type you use.<br /><br />
The numbers below are for 6DJ8.<br />
<br />
The 6DJ8's heater is half the voltage (6.3V) and twice the current (365mA).<br /><br />
It requires series resistance to drop the extra 19V, and a power supply for the extra current.<br /><br />
The supply must be isolated and electrically quiet.<br />
<br />
You might think you could just wire them in parallel and run off 6.3VAC,<br /><br />
but some mainframes elevate that rail to +100V, which will put an uncomfortable 200V between heater and cathode on V124.<br /><br />
Besides, Tek used DC to avoid hum.<br />
<br />
:A) Add 100 ohm 5W in series with R290.<br />
:I put it on a three-point terminal strip bolted to the top of R290.<br />
<br />
:B) Add isolated current source across V124-V214-V114.<br />
:Start with either a 6V-24V step-up transformer (details below), rectifier and reservoir, or a shielded switching supply powered by +350V.<br />
:The current regulator is just an LM317 with a resistor between OUT and ADJUST, and take output from ADJUST.<br />
:Two 1/4W resistors in parallel, one 18 ohm, the other 12 ohm, gives 180mA, raising the total to 360mA. Or two 15's and a 100.<br />
<br />
;The supply must handle 100V backfeed if a tube burns out.<br />
;Just put a diode in series. That's why I regulate current instead of voltage.<br />
<br />
===2. 12AT7===<br />
<br />
:A) Add 1200 ohm 2W in parallel with V124-V214-V114. This bypasses 30mA around the tubes, reducing the heater current from 180mA to 150mA.<br />
<br />
:B) Tek used XV214 pin 9 as a tie point. It must float when 12AT7 is used, because it's heater center-tap.<br />
<br />
: C) V114B and V214B grids must be biased 3V positive for successful operation of the Q154-12AT7 cascode.<br />
: Details below.<br />
<br />
===3. OTHER TYPES - NOT TESTED===<br />
<br />
: 12AZ7 requires supplement and grid bias. Curves == 12AT7. Meets Vhk.<br />
: 12BZ7 requires supplement and grid bias. Meets Vhk.<br />
: 12DT8 requires shunt R and grid bias. Curves == 12AT7.<br />
: 6BQ7/6BZ7/6BS8/8BQ7A require series R + supplement + grid bias.<br />
<br />
===HEATER-CATHODE BREAKDOWN===<br />
<br />
Most types exceed their Vhk spec. Including 8416 itself, assuming<br />
it's the same as 6DJ8. If Tek can ignore it so can we, I guess.<br />
<br />
===TUBE TYPES THAT DO NOT WORK===<br />
<br />
12AU7 <br />
12AV7<br />
12AX7<br />
12AY7<br />
12BH7<br />
<br />
===EFFECT OF V124 HEATER-CATHODE SHORT===<br />
<br />
:R126 will smoke.<br />
: Cathode may arc to grid but I don't see it burning anything.<br />
:Stuff downstream might get hot.<br />
<br />
===TRANSFORMER POWER SUPPLY FOR 6DJ8===<br />
<br />
I used 120-0252-00, which is used in Type 3T77 and 3T77A. I have several.<br />
<br />
The best position is the rear bulkhead upper right corner with the long axis vertical.<br /><br />
I put the rectifier/cap/regulator<br />
on the rear bulkhead to the left of the transformer, securing<br />
the rectifier and cap with hot glue to facilitate short leads.<br /><br />
I strung the diode between the cap and the LM317 to avoid a tie point.<br /><br />
With 200uF/50V (two 100's in parallel), I see 4V peak to peak ripple<br />
at IN, with the trough 8V above OUT. It's a symmetrical triangle wave.<br /><br />
I heat-sinked the LM317 to the rear bulkhead, with a mica insulator.<br />
<br />
I can't see any hum at 1mV and line triggering.<br />
<br />
Maybe can use 120-0481-00, used in Type 1A4.<br /><br />
It has a 20V winding that puts out 135mA, should be okay at 180mA since the other winding won't be used.<br />
<br />
120-0177-00 (used in Type Z) is 6V-6V, so it's no good.<br />
<br />
Maybe a 110V-36V transformer on pins 13-14 with primary and secondary reversed, rectifier, filter, and LM317.<br /><br />
The transformer needs to have low magnetic field because it's right next to the tubes.<br />
<br />
One aliexpress candidate is YHDC.<br /><br />
If we reverse a 110V primary, we need at least a 20VA rating to stay within spec for copper loss.<br /><br />
That means a big transformer, and hum unless you shield.<br /><br />
Specify 110V|110V primary and 15+15 secondary.<br /><br />
Convenient available space in the plugin is 65x50x50mm.<br /><br />
Here are YHDC 20VA transformers.<br /><br />
<br />
PE5424E-M is PCB mount, 57x48x44mm. Not a toroid.<br /><br />
The following don't fit.<br />
:PE5424K-M PCB mount plus holes, 75x49x44mm.<br />
: LKB5424-L bolt-down with wire leads, 75x43x50mm.<br />
:PU3917B low-profile bolt-down, 68x55x33mm.<br />
: PTC25 25VA PCB with hole toroid 60x60x38mm.<br />
<br />
===SWITCHING POWER SUPPLY FOR 6DJ8===<br />
<br />
Here's a $3 6W model.<br /><br />
Sanmim SM-PLG06A-24.<br /><br />
51x24x19mm.<br /><br />
<br />
Several stores sell this. Just search for "sanmim" or "sanmin" and grovel through the hundreds of hits for 24V and 5W or 6W.<br /><br />
I bought mine at "Your Cee".<br />
<br />
>>> SUCCESS!<br />
<br />
Mounted in a steel box, with simple filtering on input (1K) and output lines (0.33uF), it causes barely perceptible trace thickening at 1mV.<br />
<br />
===GRID BIAS INCREASE FOR 12AT7===<br />
<br />
Applied to S/N 2369 and 7111<br />
<br />
12AT7 is fine as-is in V124 and V114A/V214A, but V114B/V214B need an additional mod.<br /><br />
<br />
Q154's Vce is the tube's grid bias.<br /><br />
The 6DJ8 operates at -2.5V, which gives Q154 2V.<br /><br />
The 12AT7 is only -0.5V, so Q154 starves.<br /><br />
<br />
We must give the grids a positive offset.<br />
<br />
I tried a resistive divider. (100K/100nF to 10Meg to +350V.)<br /><br />
This fails due to grid current from captured electrons, a normal phenomenon in low-bias tubes like the 12AT7.<br />
<br />
Batteries work. One CR2032 in series with R152/R252.<br /><br />
Minus side to Q154 emitter, plus side to the resistor.<br /><br />
Out of RF paranoia I put a cap across each battery.<br /><br />
100nF axial-lead MLCC fits in the small space.<br /><br />
Ig varies from 10uA to 70uA depending on the tube.<br /><br />
Since current is drawn only while the instrument is running,<br />
the batteries should last for their shelf life.<br /><br />
I put them in insulated wire-lead holders anyway, to make replacement easy and to keep them from shorting.<br /><br />
The batteries dangle below the ceramic strips to minimize stray capacitance.<br /><br />
I unsoldered 5 terminals (silver-bearing solder!) and levered parts and wires out of the way to reach R152/R252.<br /><br />
<br />
It's easier than it sounds.<br /><br />
The grid bias mod is necessary for the 12AT7, but it's compatible with all tube types.<br />
<br />
===End of ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416===</div>Vintage davehttps://w140.com/tekwiki/index.php?title=1S1/Repairs&diff=748271S1/Repairs2022-05-10T23:40:35Z<p>Vintage dave: Fixed the 145</p>
<hr />
<div>==ADAPTING TYPE 1S1 TO USE 12AU7 INSTEAD OF 8416==<br />
<br />
Untested.<br />
<br />
V183 is being used as a pair of cathode followers driving the plugin interface slowly, so it's not critical.<br />
After ensuring that pin 9 is no-connect, I think you can drop in a 12AU7 and shunt the heater with 400 ohms 1W.<br />
Grid current prohibits use of 12AT7.<br />
<br />
In my opinion, V44 has to remain 8416/12DJ8. High gm is required, along with no grid current,<br />
and there's no practical way to power a 6DJ8. So you can get a 1S1 down to one 8416 but not down to none.<br />
<br />
==David Wise 1S1 (S/N 002993) repair notes - August 2017==<br />
<br />
===SYMPTOM===<br />
Unsynchronized trace - blizzard of samples -<br />
no reaction to TRIGGER SENSITIVITY.<br />
<br />
Slight reaction to RECOVERY TIME.<br />
Reaction to TIME/CM recovery range.<br />
<br />
====DIAGNOSIS====<br />
Trigger free-running due to slight misadjustment of R420 or R460.<br />
<br />
====TREATMENT====<br />
Adjust INT TRIG LEVEL R420 and CONTROL TD BIAS R460.<br />
I did whatever it took to get triggering - need to redo per manual.<br />
<br />
===SYMPTOM===<br />
Vertical shift as SMOOTHING is turned.<br />
<br />
====TREATMENT====<br />
Adjust R110 MEMORY BALANCE.<br />
:Step 14, page 5-23.<br />
<br />
===SYMPTOM===<br />
Vertical shift as mVOLTS/CM is turned.<br />
<br />
====TREATMENT====<br />
Adjust R30 BRIDGE BALANCE<br />
:Step 15, page 5-23.<br />
<br />
===SYMPTOM===<br />
Vertical shift as mVOLTS/CM VARIABLE is turned.<br />
<br />
====TREATMENT====<br />
Adjust VAR BAL<br />
:Step 16, page 5-24.<br />
<br />
===SYMPTOM===<br />
Trace not centered when VERT POSITION is centered.<br />
<br />
Adjust R194 POSITION RANGE<br />
:Step 17, page 5-24.<br />
<br />
===PREEMPTIVE TREATMENTS===<br />
<br />
Adjust +19 V / -19 V<br />
<br />
Adjust INT TRIG LEVEL R420<br />
:Step 4, page 5-11.<br />
<br />
Adjust CONTROL TD BIAS R460<br />
:Step 5, page 5-11+.<br />
:Readjust R420.<br />
<br />
Adjust STAIRCASE DC LEVEL<br />
:Step 6, page 5-13.<br />
<br />
Adjust INVERTER DC ZERO<br />
:Step 7, page 5-13+.<br />
<br />
Adjust DELAY ZERO<br />
:Step 11, page 5-20.<br />
:Used 106 instead of TD Pulse Generator.<br />
<br />
Steps 18-19 want 111 Pretrigger Pulse Generator, 20 ns pulses at 40 kHz.<br />
:Can I get by with Wavetek 145? 25 ns width, 6.5 ns rise at TTL jack.<br />
:How about the 281 TDR Pulser? 460 mV, 5 ns wide, 750 ps fall, about 50-100 kHz.<br />
:How about the 106 Square Wave Generator?<br />
<br />
Adjust Loop Gain<br />
:Step 18, page 5-27+.<br />
<br />
Don't need 111 Pretrigger Pulse Generator; 281 TDR Pulser works fine.<br />
460 mV, 15 μs wide, 750 ps fall, about 50-100 kHz.<br />
<br />
Double trigger: the goal is to trigger on both the rising and falling edge of<br />
the signal. That's twice the signal frequency, and it makes the 1S1<br />
take alternating samples of high and low voltage. This is a stress test<br />
on the memory circuit; it will reveal the slightest aberration in loop gain.<br />
Just advance TRIGGER SENSITIVITY while tweaking RECOVERY TIME.<br />
<br />
Wavetek 145 works, on either FUNCTION or TTL output, but double trigger is harder.<br />
SYNC and TTL outputs need attenuators too.<br />
<br />
106 works well, and you can test all mVOLTS/CM settings using external trigger.<br />
Cable the trigger straight in, and signal from FAST output via attenuator like HP 355D.<br />
Set near max frequency, tweak SENSITIVITY on the 1S1 and frequency and symmetry on the 106.<br />
<br />
===SYMPTOM===<br />
Noisy/intermittent changes in loop gain when mVOLTS/CM VAR knob is turned.<br />
<br />
Gain settled down to a constant value after manhandling the switch assembly,<br />
that is, grasping it and applying twisting and rocking stresses.<br />
<br />
Noise reappeared next day.<br />
<br />
====TENTATIVE DIAGNOSIS 1====<br />
Corroded ground path to chassis changing attenuation.<br />
<br />
Why use chassis? Recipe for trouble.<br />
<br />
Maybe there's a weak or open path somewhere and it's going<br />
through the chassis when it shouldn't.<br />
<br />
====TENTATIVE DIAGNOSIS 2====<br />
Dirty switch contacts go partially open when assembly is flexed just right.<br />
<br />
===SYMPTOM===<br />
Insufficient loop gain.<br />
<br />
C135 (Memory Gain) at minimum (max gain), R95 (Memory Gate Width) at optimum,<br />
loop gain still slightly less than 1.<br />
<br />
Less than 1 at all mVOLTS/CM settings except 2 mV inconclusive, too much noise.<br />
(Use Wavetek 145 and external trigger.)<br />
<br />
Have not messed with Bridge Standoff or Snapoff Current.<br />
<br />
===SYMPTOM===<br />
Wavetek 145 PULSE mode functions intermittently. (FUNCTION modes are okay.)<br />
<br />
Wavetek 145 SYNC output functions intermittently. (FUNCTION output okay.)<br />
<br />
Reacts to percussion. (Whack it on the side.)<br />
<br />
Just what I need, a tool breaking in my hands.<br />
<br />
====DIAGNOSIS====<br />
Bad solder joint in a power supply connector.<br />
<br />
===TODO===<br />
<br />
Adjust Timing Cal<br />
:Step 8, page 5-15.<br />
<br />
Or:<br />
# Feed attenuated 5us time marks to SIGNAL IN<br />
# Set TIME/CM to 5 μSEC<br />
# Adjust 1S1 for reasonable display<br />
# Indicator scope in X-Y<br />
# W/Z/1A5 in A-Vc mode<br />
# Connect VERT OUTPUT to X<br />
# Connect HORIZ OUTPUT to W/Z/1A5 PLUS<br />
# Adjust R335 for 1 pulse per volt<br />
<br />
Adjust Comparator Level<br />
:Step 9, page 5-16.<br />
<br />
Adjust 50 ns Ramp Timing<br />
:Step 10, page 5-17+.<br />
<br />
Adjust Sweep Length<br />
:Step 12, page 5-20.<br />
<br />
Adjust Bridge Standoff<br />
:Step 19, page 5-29+.<br />
<br />
Trying it with Wavetek 145 FUNCTION output.<br />
Can't get a nice 20 ns pulse, use 50 ns and set 1S1 to 10 ns.<br />
(Maybe it's because the 145 has the wrong output transistors right now.)<br />
I can see oddness at about 5 V<sub>p-p</sub>, but not what the manual pictures.<br />
<br />
20 WANTS 067-0513-00 TUNNEL DIODE PULSER, <35ps RISETIME<br />
:How about 284, 70 ps?<br />
:How about 067-0681-01, 125 ps?<br />
:Not 281, 0.75 ns.<br />
:Not 065-0544-00, 1 ns.<br />
:Not TU-5, 1.5 ns.<br />
<br />
Adjust Risetime<br />
:Step 20, page 5-30+.<br />
<br />
Adjust Vertical Gain<br />
:Step 21, page 5-33.<br />
<br />
===October 2017===<br />
<br />
Tweaking Bridge Standoff and Snapoff Current can raise loop<br />
gain to 1 without - I think - missing the risetime and input voltage specs.<br />
<br />
==VintageTek Museum 1S1==<br />
<br />
No trigger.<br />
You can test D449 in-circuit if you remove Q254.<br />
<br />
I noticed that the bad D449 still had switching action, but with elevated V<sub>p</sub>.<br />
This diode is more or less in parallel with germanium transistor Q254.<br />
Due to the high V<sub>p</sub>, Q254 was on continuously. I wanted to see if the circuit would work if I popped in a 2N3904.<br />
<br />
No go, so I went ahead and installed a new 152-0154-00 for D449. That got reasonable action in the sampler, memory, fast ramp, and staircase! But only if I set Trigger to FREE RUN.<br />
<br />
Then I put in a new 152-0771-01 for D430 and got normal triggering. At this point everything seems to be working; it just needs calibration.<br />
<br />
I found that the risetime is way slow, almost half a nanosecond. I think it's because the SNAPOFF CURRENT was cranked to maximum. I backed off to 350ps, but<br />
I forgot to check BRIDGE STANDOFF (which also affects risetime and loop gain), so it may have been wasted work. If not, then I have solved the riddle of the excess<br />
loop gain, because now there's only about 10% spare. That is so close to 0% (my instrument) that unless some new revelation comes along, I think I<br />
will leave mine alone. I was all set to borrow sampling diodes from the Museum's instrument and install spare Memory Gate diodes. I think MEM BAL<br />
indirectly affects gain, but I haven't wrapped my head around it yet.<br />
<br />
-------------------------------------------------------------------------<br />
<br />
Nailed the culprit but don't understand the crime.<br />
<br />
Q80, the Snapoff Diode driver, was weak. That is, when I installed a spare<br />
(and turned down the Snapoff Current to get back to 350 ps risetime), there<br />
was plenty of gain.<br />
<br />
I tried a bunch of other transistors, including some HF Germanium types, and MPSH81 and 2N4258. Nothing.<br />
<br />
This is a 151-0083-00, 2N964 Selected. But selected for what? I can't find any specs.<br />
<br />
Right after I figured this out, one of my sample bridge diodes opened up. I have ordered some HSMS-8202's.<br />
<br />
9-October-2017. Probably selected for avalanche performance on some<br />
test jig I don't have a description of. The good -0083 avalanches at<br />
20 V while the poor one avalanches at 30 V. That's on my Heathkit IT-1121<br />
Curve Tracer, no steps, 50 μA/step, 10K. Maybe 30 V is too far from 19V,<br />
the normal operating point. The manual does say "a few volts short of avalanche."<br />
<br />
I have a couple of generic 2N964's coming.<br />
I ordered two -0083 from Vernonia Northern but have not heard back.<br />
Hakan Hintze of TekScopes is mailing me some too.<br />
For free! Plus sampling diodes. What a guy.<br />
<br />
15-October-2017. The replacement -0083's performed worse than the original,<br />
and the generic 2N964's worse still. Eventually I discovered the secret sauce.<br />
<br />
#LEAD LENGTH. As you insert Q80 deeper in the socket, loop gain rises.<br />Cut the leads to absolute minimum. Also grind the socket down.<br />I'm thinking of removing the socket and sinking individual contacts into the board, or even omitting it altogether and soldering the transistor.<br />
#LEAD DRESS. Move the T88 red output wire (positive bridge strobe) as far away from the bridge output as possible.<br />
<br />
Adjust in the following order.<br />
:(a) BRIDGE STANDOFF for 2 V positive or negative input without baseline lift;<br />
:(b) BRIDGE BALANCE for no baseline shift across mVOLTS/CM;<br />
:(c) SNAPOFF CURRENT for 350 ps risetime;<br />
:(d) MEMORY GATE WIDTH for maximum loop gain;<br />
:(e) MEMORY BALANCE for no baseline shift across SMOOTHING;<br />
:(f) LOOP GAIN to maximum.<br />
<br />
Until you've performed the above steps, comparing loop gain is meaningless.<br />
<br />
After performing the above, my 1S1 maximum loop gain is 1.18.<br />
<br />
I was using three original sampling bridge diodes and one borrowed from the VintageTek Museum's 1S1, which I'm also working on.<br />
<br />
When adjusted, VT's 1S1 also topped out at 1.18, in spite of the drastic difference in snapoff current - 13 mA vs 40 mA. That difference only occurs<br />
when VT's Q80 and VT's D87 are installed. Substitute either part and you're back to 40 mA.<br />
<br />
Same thing happens if VT's Q80 and D87 are in my 1S1. Some kind of magic there, those two parts are just made for each other.<br />
<br />
I've been thinking about the 1S1's bridge sample strobe circuit, a snapoff diode driven by an avalanche transistor. <br />
Except for a 1 nF coupling cap, there's nothing between the collector and the cathode except circuit board trace.<br />
<br />
Between pulses, the transistor is off, collector at -19 V and the cap charged.<br />
The diode is forward-biased, so the junction is full of charge carriers.<br />
When the transistor avalanches, it wants to go from high-voltage no current to low-voltage high current, RIGHT NOW, but the diode stolidly continues to conduct until the last carrier is out.<br />
<br />
It's the classic case of irresistible force vs immovable object. I suppose it's the transistor that gives, via collector region resistance.<br />
<br />
I suppose trace inductance does a little bit to isolate the two, but in that case,<br />
wouldn't you think that less inductance would mean less stored energy and a smaller<br />
pulse? But the opposite seems to be true, since shorter transistor leads equals<br />
higher loop gain. I don't know what to make of it.<br />
<br />
==22-October-2017==<br />
<br />
I built four HSMS-8202 modules to replace D11. Each HSMS-8202 is two<br />
diodes in series which gives about 8V breakdown. A "T" of bare fiberglass<br />
1/16" circuit board material. It has to be clean to avoid leakage.<br />
1/4" x 1/4" trunk and 1/16" x 1/16" arms at one end of the trunk.<br />
<br />
File the corners of the arms so the cross section is octagonal.<br />
Glue the HSMS-8202 between the arms. Wrap the arms with #30 wire-wrap wire.<br />
Solder to HSMS-8202 and solder the wrapped wire. File down to 0.090" diameter.<br />
Plug in and enjoy.<br />
<br />
I got max loop gain of 1.28 (vs 1.15 with 152-0433) and bridge standoff > 2 V.<br />
I didn't have to change snapoff current much.<br />
<br />
Two of the modules are leaky, about 25Meg vs about 25 ns. I hoped it was a flux bridge,<br />
but when I built a blank under dirty conditions, it was fine. So I damaged the<br />
chips, or maybe they were bad already. I was able to use them anyway. I put them<br />
on the input corner, which is low impedance.<br />
<br />
==Tom Lee at TekScopes, 9-Dec-2020==<br />
The 8202 is a VERY delicate beast (typical trade off between robustness and speed here).<br />
It is easily damaged by ESD during handling. It's a 4 V breakdown device, as compared to<br />
the HSMS-2825's much greater 15V breakdown. Less-capable diodes would work as well in<br />
this case, and would probably be more robust. As you and Jim Ford have noted, the HSMS<br />
diodes are now officially obsolete, so the usual distributors no longer stock them. But<br />
I see that Dan's Small Parts and Kits has HSMS-2825 (dual diodes) at 10 for a buck. Hard<br />
to beat that. Buy a bunch more stuff to get your shipping dollar's worth.<br />
Me: HSMS-2825 is two unconnected diodes. HSMS-2822 is a series pair which crosses<br />
to Macom MA4E1338B1. HSMS-2825 has no direct cross. I'd use Infineon BAT68-04,<br />
in stock at Mouser for $0.39 each. Or BAT17-04 but it is delicate like HSMS-8202.<br />
<br />
SYMPTOM: Drift in MEM BAL, with drastic readjustment needed when switching extenders<br />
or mainframes.<br />
<br />
CAUSE: The heater current regulator was shorted, maybe since the instrument was new!<br />
There was no insulation on the transistor pins, and E was touching the heat sink and<br />
shorting to C. The heat sink is anodized, but I guess there's a weak spot in the hole.<br />
<br />
POOR FIX: Reposition the heat sink. DONE.<br />
BETTER FIX: Put insulation on the pins. Has to endure soldering heat briefly.<br />
<br />
ALSO: There was no heat sink grease! I added some, but not everywhere, only<br />
what I'd applied to a D44C8 before I realized the old transistor was okay.<br />
<br />
<br />
[[Category:Instrument repair reports]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=1S1/Repairs&diff=748261S1/Repairs2022-05-10T23:38:26Z<p>Vintage dave: 12AU7 instead of 8416 - untested</p>
<hr />
<div>==ADAPTING TYPE 1S1 TO USE 12AU7 INSTEAD OF 8416==<br />
<br />
Untested.<br />
<br />
V183 is being used as a pair of cathode followers driving the plugin interface slowly, so it's not critical.<br />
After ensuring that pin 9 is no-connect, I think you can drop in a 12AU7 and shunt the heater with 400 ohms 1W.<br />
Grid current prohibits use of 12AT7.<br />
<br />
In my opinion, V44 has to remain 8416/12DJ8. High gm is required, along with no grid current,<br />
and there's no practical way to power a 6DJ8. So you can get a 1S1 down to one 8416 but not down to none.<br />
<br />
==David Wise 1S1 (S/N 002993) repair notes - August 2017==<br />
<br />
===SYMPTOM===<br />
Unsynchronized trace - blizzard of samples -<br />
no reaction to TRIGGER SENSITIVITY.<br />
<br />
Slight reaction to RECOVERY TIME.<br />
Reaction to TIME/CM recovery range.<br />
<br />
====DIAGNOSIS====<br />
Trigger free-running due to slight misadjustment of R420 or R460.<br />
<br />
====TREATMENT====<br />
Adjust INT TRIG LEVEL R420 and CONTROL TD BIAS R460.<br />
I did whatever it took to get triggering - need to redo per manual.<br />
<br />
===SYMPTOM===<br />
Vertical shift as SMOOTHING is turned.<br />
<br />
====TREATMENT====<br />
Adjust R110 MEMORY BALANCE.<br />
:Step 14, page 5-23.<br />
<br />
===SYMPTOM===<br />
Vertical shift as mVOLTS/CM is turned.<br />
<br />
====TREATMENT====<br />
Adjust R30 BRIDGE BALANCE<br />
:Step 15, page 5-23.<br />
<br />
===SYMPTOM===<br />
Vertical shift as mVOLTS/CM VARIABLE is turned.<br />
<br />
====TREATMENT====<br />
Adjust VAR BAL<br />
:Step 16, page 5-24.<br />
<br />
===SYMPTOM===<br />
Trace not centered when VERT POSITION is centered.<br />
<br />
Adjust R194 POSITION RANGE<br />
:Step 17, page 5-24.<br />
<br />
===PREEMPTIVE TREATMENTS===<br />
<br />
Adjust +19 V / -19 V<br />
<br />
Adjust INT TRIG LEVEL R420<br />
:Step 4, page 5-11.<br />
<br />
Adjust CONTROL TD BIAS R460<br />
:Step 5, page 5-11+.<br />
:Readjust R420.<br />
<br />
Adjust STAIRCASE DC LEVEL<br />
:Step 6, page 5-13.<br />
<br />
Adjust INVERTER DC ZERO<br />
:Step 7, page 5-13+.<br />
<br />
Adjust DELAY ZERO<br />
:Step 11, page 5-20.<br />
:Used 106 instead of TD Pulse Generator.<br />
<br />
Steps 18-19 want 111 Pretrigger Pulse Generator, 20 ns pulses at 40 kHz.<br />
:Can I get by with Wavetek 145? 25 ns width, 6.5 ns rise at TTL jack.<br />
:How about the 281 TDR Pulser? 460 mV, 5 ns wide, 750 ps fall, about 50-100 kHz.<br />
:How about the 106 Square Wave Generator?<br />
<br />
Adjust Loop Gain<br />
:Step 18, page 5-27+.<br />
<br />
Don't need 111 Pretrigger Pulse Generator; 281 TDR Pulser works fine.<br />
460 mV, 15 μs wide, 750 ps fall, about 50-100 kHz.<br />
<br />
Double trigger: the goal is to trigger on both the rising and falling edge of<br />
the signal. That's twice the signal frequency, and it makes the 1S1<br />
take alternating samples of high and low voltage. This is a stress test<br />
on the memory circuit; it will reveal the slightest aberration in loop gain.<br />
Just advance TRIGGER SENSITIVITY while tweaking RECOVERY TIME.<br />
<br />
Wavetek 145 works, on either FUNCTION or TTL output, but double trigger is harder.<br />
SYNC and TTL outputs need attenuators too.<br />
<br />
106 works well, and you can test all mVOLTS/CM settings using external trigger.<br />
Cable the trigger straight in, and signal from FAST output via attenuator like HP 355D.<br />
Set near max frequency, tweak SENSITIVITY on the 1S1 and frequency and symmetry on the 106.<br />
<br />
===SYMPTOM===<br />
Noisy/intermittent changes in loop gain when mVOLTS/CM VAR knob is turned.<br />
<br />
Gain settled down to a constant value after manhandling the switch assembly,<br />
that is, grasping it and applying twisting and rocking stresses.<br />
<br />
Noise reappeared next day.<br />
<br />
====TENTATIVE DIAGNOSIS 1====<br />
Corroded ground path to chassis changing attenuation.<br />
<br />
Why use chassis? Recipe for trouble.<br />
<br />
Maybe there's a weak or open path somewhere and it's going<br />
through the chassis when it shouldn't.<br />
<br />
====TENTATIVE DIAGNOSIS 2====<br />
Dirty switch contacts go partially open when assembly is flexed just right.<br />
<br />
===SYMPTOM===<br />
Insufficient loop gain.<br />
<br />
C135 (Memory Gain) at minimum (max gain), R95 (Memory Gate Width) at optimum,<br />
loop gain still slightly less than 1.<br />
<br />
Less than 1 at all mVOLTS/CM settings except 2 mV inconclusive, too much noise.<br />
(Use Wavetek 145 and external trigger.)<br />
<br />
Have not messed with Bridge Standoff or Snapoff Current.<br />
<br />
===SYMPTOM===<br />
Wavetek 145 PULSE mode functions intermittently. (FUNCTION modes are okay.)<br />
<br />
Wavetek 145 SYNC output functions intermittently. (FUNCTION output okay.)<br />
<br />
Reacts to percussion. (Whack it on the side.)<br />
<br />
Just what I need, a tool breaking in my hands.<br />
<br />
===TODO===<br />
<br />
Adjust Timing Cal<br />
:Step 8, page 5-15.<br />
<br />
Or:<br />
# Feed attenuated 5us time marks to SIGNAL IN<br />
# Set TIME/CM to 5 μSEC<br />
# Adjust 1S1 for reasonable display<br />
# Indicator scope in X-Y<br />
# W/Z/1A5 in A-Vc mode<br />
# Connect VERT OUTPUT to X<br />
# Connect HORIZ OUTPUT to W/Z/1A5 PLUS<br />
# Adjust R335 for 1 pulse per volt<br />
<br />
Adjust Comparator Level<br />
:Step 9, page 5-16.<br />
<br />
Adjust 50 ns Ramp Timing<br />
:Step 10, page 5-17+.<br />
<br />
Adjust Sweep Length<br />
:Step 12, page 5-20.<br />
<br />
Adjust Bridge Standoff<br />
:Step 19, page 5-29+.<br />
<br />
Trying it with Wavetek 145 FUNCTION output.<br />
Can't get a nice 20 ns pulse, use 50 ns and set 1S1 to 10 ns.<br />
(Maybe it's because the 145 has the wrong output transistors right now.)<br />
I can see oddness at about 5 V<sub>p-p</sub>, but not what the manual pictures.<br />
<br />
20 WANTS 067-0513-00 TUNNEL DIODE PULSER, <35ps RISETIME<br />
:How about 284, 70 ps?<br />
:How about 067-0681-01, 125 ps?<br />
:Not 281, 0.75 ns.<br />
:Not 065-0544-00, 1 ns.<br />
:Not TU-5, 1.5 ns.<br />
<br />
Adjust Risetime<br />
:Step 20, page 5-30+.<br />
<br />
Adjust Vertical Gain<br />
:Step 21, page 5-33.<br />
<br />
===October 2017===<br />
<br />
Tweaking Bridge Standoff and Snapoff Current can raise loop<br />
gain to 1 without - I think - missing the risetime and input voltage specs.<br />
<br />
==VintageTek Museum 1S1==<br />
<br />
No trigger.<br />
You can test D449 in-circuit if you remove Q254.<br />
<br />
I noticed that the bad D449 still had switching action, but with elevated V<sub>p</sub>.<br />
This diode is more or less in parallel with germanium transistor Q254.<br />
Due to the high V<sub>p</sub>, Q254 was on continuously. I wanted to see if the circuit would work if I popped in a 2N3904.<br />
<br />
No go, so I went ahead and installed a new 152-0154-00 for D449. That got reasonable action in the sampler, memory, fast ramp, and staircase! But only if I set Trigger to FREE RUN.<br />
<br />
Then I put in a new 152-0771-01 for D430 and got normal triggering. At this point everything seems to be working; it just needs calibration.<br />
<br />
I found that the risetime is way slow, almost half a nanosecond. I think it's because the SNAPOFF CURRENT was cranked to maximum. I backed off to 350ps, but<br />
I forgot to check BRIDGE STANDOFF (which also affects risetime and loop gain), so it may have been wasted work. If not, then I have solved the riddle of the excess<br />
loop gain, because now there's only about 10% spare. That is so close to 0% (my instrument) that unless some new revelation comes along, I think I<br />
will leave mine alone. I was all set to borrow sampling diodes from the Museum's instrument and install spare Memory Gate diodes. I think MEM BAL<br />
indirectly affects gain, but I haven't wrapped my head around it yet.<br />
<br />
-------------------------------------------------------------------------<br />
<br />
Nailed the culprit but don't understand the crime.<br />
<br />
Q80, the Snapoff Diode driver, was weak. That is, when I installed a spare<br />
(and turned down the Snapoff Current to get back to 350 ps risetime), there<br />
was plenty of gain.<br />
<br />
I tried a bunch of other transistors, including some HF Germanium types, and MPSH81 and 2N4258. Nothing.<br />
<br />
This is a 151-0083-00, 2N964 Selected. But selected for what? I can't find any specs.<br />
<br />
Right after I figured this out, one of my sample bridge diodes opened up. I have ordered some HSMS-8202's.<br />
<br />
9-October-2017. Probably selected for avalanche performance on some<br />
test jig I don't have a description of. The good -0083 avalanches at<br />
20 V while the poor one avalanches at 30 V. That's on my Heathkit IT-1121<br />
Curve Tracer, no steps, 50 μA/step, 10K. Maybe 30 V is too far from 19V,<br />
the normal operating point. The manual does say "a few volts short of avalanche."<br />
<br />
I have a couple of generic 2N964's coming.<br />
I ordered two -0083 from Vernonia Northern but have not heard back.<br />
Hakan Hintze of TekScopes is mailing me some too.<br />
For free! Plus sampling diodes. What a guy.<br />
<br />
15-October-2017. The replacement -0083's performed worse than the original,<br />
and the generic 2N964's worse still. Eventually I discovered the secret sauce.<br />
<br />
#LEAD LENGTH. As you insert Q80 deeper in the socket, loop gain rises.<br />Cut the leads to absolute minimum. Also grind the socket down.<br />I'm thinking of removing the socket and sinking individual contacts into the board, or even omitting it altogether and soldering the transistor.<br />
#LEAD DRESS. Move the T88 red output wire (positive bridge strobe) as far away from the bridge output as possible.<br />
<br />
Adjust in the following order.<br />
:(a) BRIDGE STANDOFF for 2 V positive or negative input without baseline lift;<br />
:(b) BRIDGE BALANCE for no baseline shift across mVOLTS/CM;<br />
:(c) SNAPOFF CURRENT for 350 ps risetime;<br />
:(d) MEMORY GATE WIDTH for maximum loop gain;<br />
:(e) MEMORY BALANCE for no baseline shift across SMOOTHING;<br />
:(f) LOOP GAIN to maximum.<br />
<br />
Until you've performed the above steps, comparing loop gain is meaningless.<br />
<br />
After performing the above, my 1S1 maximum loop gain is 1.18.<br />
<br />
I was using three original sampling bridge diodes and one borrowed from the VintageTek Museum's 1S1, which I'm also working on.<br />
<br />
When adjusted, VT's 1S1 also topped out at 1.18, in spite of the drastic difference in snapoff current - 13 mA vs 40 mA. That difference only occurs<br />
when VT's Q80 and VT's D87 are installed. Substitute either part and you're back to 40 mA.<br />
<br />
Same thing happens if VT's Q80 and D87 are in my 1S1. Some kind of magic there, those two parts are just made for each other.<br />
<br />
I've been thinking about the 1S1's bridge sample strobe circuit, a snapoff diode driven by an avalanche transistor. <br />
Except for a 1 nF coupling cap, there's nothing between the collector and the cathode except circuit board trace.<br />
<br />
Between pulses, the transistor is off, collector at -19 V and the cap charged.<br />
The diode is forward-biased, so the junction is full of charge carriers.<br />
When the transistor avalanches, it wants to go from high-voltage no current to low-voltage high current, RIGHT NOW, but the diode stolidly continues to conduct until the last carrier is out.<br />
<br />
It's the classic case of irresistible force vs immovable object. I suppose it's the transistor that gives, via collector region resistance.<br />
<br />
I suppose trace inductance does a little bit to isolate the two, but in that case,<br />
wouldn't you think that less inductance would mean less stored energy and a smaller<br />
pulse? But the opposite seems to be true, since shorter transistor leads equals<br />
higher loop gain. I don't know what to make of it.<br />
<br />
==22-October-2017==<br />
<br />
I built four HSMS-8202 modules to replace D11. Each HSMS-8202 is two<br />
diodes in series which gives about 8V breakdown. A "T" of bare fiberglass<br />
1/16" circuit board material. It has to be clean to avoid leakage.<br />
1/4" x 1/4" trunk and 1/16" x 1/16" arms at one end of the trunk.<br />
<br />
File the corners of the arms so the cross section is octagonal.<br />
Glue the HSMS-8202 between the arms. Wrap the arms with #30 wire-wrap wire.<br />
Solder to HSMS-8202 and solder the wrapped wire. File down to 0.090" diameter.<br />
Plug in and enjoy.<br />
<br />
I got max loop gain of 1.28 (vs 1.15 with 152-0433) and bridge standoff > 2 V.<br />
I didn't have to change snapoff current much.<br />
<br />
Two of the modules are leaky, about 25Meg vs about 25 ns. I hoped it was a flux bridge,<br />
but when I built a blank under dirty conditions, it was fine. So I damaged the<br />
chips, or maybe they were bad already. I was able to use them anyway. I put them<br />
on the input corner, which is low impedance.<br />
<br />
==Tom Lee at TekScopes, 9-Dec-2020==<br />
The 8202 is a VERY delicate beast (typical trade off between robustness and speed here).<br />
It is easily damaged by ESD during handling. It's a 4 V breakdown device, as compared to<br />
the HSMS-2825's much greater 15V breakdown. Less-capable diodes would work as well in<br />
this case, and would probably be more robust. As you and Jim Ford have noted, the HSMS<br />
diodes are now officially obsolete, so the usual distributors no longer stock them. But<br />
I see that Dan's Small Parts and Kits has HSMS-2825 (dual diodes) at 10 for a buck. Hard<br />
to beat that. Buy a bunch more stuff to get your shipping dollar's worth.<br />
Me: HSMS-2825 is two unconnected diodes. HSMS-2822 is a series pair which crosses<br />
to Macom MA4E1338B1. HSMS-2825 has no direct cross. I'd use Infineon BAT68-04,<br />
in stock at Mouser for $0.39 each. Or BAT17-04 but it is delicate like HSMS-8202.<br />
<br />
SYMPTOM: Drift in MEM BAL, with drastic readjustment needed when switching extenders<br />
or mainframes.<br />
<br />
CAUSE: The heater current regulator was shorted, maybe since the instrument was new!<br />
There was no insulation on the transistor pins, and E was touching the heat sink and<br />
shorting to C. The heat sink is anodized, but I guess there's a weak spot in the hole.<br />
<br />
POOR FIX: Reposition the heat sink. DONE.<br />
BETTER FIX: Put insulation on the pins. Has to endure soldering heat briefly.<br />
<br />
ALSO: There was no heat sink grease! I added some, but not everywhere, only<br />
what I'd applied to a D44C8 before I realized the old transistor was okay.<br />
<br />
<br />
[[Category:Instrument repair reports]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=W/Repairs&diff=74825W/Repairs2022-05-10T20:49:58Z<p>Vintage dave: formatting</p>
<hr />
<div>ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416<br />
<br />
It's common to find a Type W plugin missing its three type 8416 electron tubes.<br />
<br />
The 8416 is the industrial version of the 12DJ8. 8416 and 12DJ8<br />
are crazy-expensive when you can find them at all. It's possible to<br />
modify Type W to use 6DJ8 (the 6V version of 12DJ8), which is expensive<br />
but readily available.<br />
<br />
Studying datasheets, I found that under the conditions<br />
in Type W, 12AT7 has almost the same gm and rp as 6DJ8.<br />
The 12AT7 is cheap and abundant.<br />
<br />
I have three Type W's. I modded serial number 7465 to use 6DJ8,<br />
and 7111 and 2369 to use 12AT7. In each case, I calibrated<br />
before the mod using my three precious 8416's, and again<br />
after the mod. Two instruments failed on bandwidth.<br />
(2369 spec is 23MHz, actual is 21MHz. 7111 spec is 26MHz,<br />
actual is 25MHz.) But they did no better with 8416's;<br />
performance is equal with 6DJ8 and slightly better with 12AT7.<br />
<br />
The two mods are about equal in difficulty.<br />
The instrument should be calibrated after either mod.<br />
<br />
1. 6DJ8/6922/ECC88/E88CC/7DJ8/PCC88<br />
<br />
NOTE: These types are often advertised as identical,<br />
but their heater current is different. You can use any<br />
type but you can't mix them. Adjust the series resistor<br />
and current supply for the type you use. The numbers<br />
below are for 6DJ8.<br />
<br />
The 6DJ8's heater is half the voltage (6.3V) and twice the<br />
current (365mA). It requires series resistance to drop the<br />
extra 19V, and a power supply for the extra current. The<br />
supply must be isolated and electrically quiet.<br />
<br />
You might think you could just wire them in parallel and<br />
run off 6.3VAC but some mainframes elevate that rail to<br />
+100V, which will put an uncomfortable 200V between heater<br />
and cathode on V124. Besides, Tek used DC to avoid hum.<br />
<br />
A) Add 100 ohm 5W in series with R290. I put it on a<br />
three-point terminal strip bolted to the top of R290.<br />
<br />
B) Add isolated current source across V124-V214-V114.<br />
Start with either a 6V-24V step-up transformer (details below),<br />
rectifier and reservoir, or a shielded switching supply powered<br />
by +350V. The current regulator is just an LM317 with a<br />
resistor between OUT and ADJUST, and take output from ADJUST.<br />
Two 1/4W resistors in parallel, one 18 ohm, the other 12 ohm,<br />
gives 180mA, raising the total to 360mA. Or two 15's and a 100.<br />
<br />
The supply must handle 100V backfeed if a tube burns out.<br />
Just put a diode in series. That's why I regulate current<br />
instead of voltage.<br />
<br />
2. 12AT7<br />
<br />
A) Add 1200 ohm 2W in parallel with V124-V214-V114. This<br />
bypasses 30mA around the tubes, reducing the heater current<br />
from 180mA to 150mA.<br />
B) Tek used XV214 pin 9 as a tie point. It must float when<br />
12AT7 is used, because it's heater center-tap.<br />
C) V114B and V214B grids must be biased 3V positive for<br />
successful operation of the Q154-12AT7 cascode.<br />
Details below.<br />
<br />
3. OTHER TYPES - NOT TESTED<br />
<br />
12AZ7 requires supplement and grid bias. Curves == 12AT7. Meets Vhk.<br />
12BZ7 requires supplement and grid bias. Meets Vhk.<br />
12DT8 requires shunt R and grid bias. Curves == 12AT7.<br />
6BQ7/6BZ7/6BS8/8BQ7A require series R + supplement + grid bias.<br />
<br />
HEATER-CATHODE BREAKDOWN<br />
<br />
Most types exceed their Vhk spec. Including 8416 itself, assuming<br />
it's the same as 6DJ8. If Tek can ignore it so can we, I guess.<br />
<br />
TUBE TYPES THAT DO NOT WORK<br />
<br />
12AU7 <br />
12AV7<br />
12AX7<br />
12AY7<br />
12BH7<br />
<br />
EFFECT OF V124 HEATER-CATHODE SHORT<br />
<br />
R126 will smoke.<br />
Cathode may arc to grid but I don't see it burning anything.<br />
Stuff downstream might get hot.<br />
<br />
TRANSFORMER POWER SUPPLY FOR 6DJ8<br />
<br />
I used 120-0252-00, which is used in Type 3T77 and 3T77A.<br />
I have several. The best position is the rear bulkhead upper<br />
right corner with the long axis vertical. I can't see any hum<br />
at 1mV and line triggering. I put the rectifier/cap/regulator<br />
on the rear bulkhead to the left of the transformer, securing<br />
the rectifier and cap with hot glue to facilitate short leads.<br />
I strung the diode between the cap and the LM317 to avoid a tie point.<br />
With 200uF/50V (two 100's in parallel), I see 4V peak to peak ripple<br />
at IN, with the trough 8V above OUT. It's a symmetrical triangle wave.<br />
I heat-sinked the LM317 to the rear bulkhead, with a mica insulator.<br />
<br />
Maybe can use 120-0481-00, used in Type 1A4. It has a 20V winding<br />
that puts out 135mA, should be okay at 180mA since the other<br />
winding won't be used.<br />
<br />
120-0177-00 (used in Type Z) is 6V-6V so it's no good.<br />
<br />
Maybe a 110V-36V transformer on pins 13-14 with<br />
primary and secondary reversed, rectifier, filter, and LM317.<br />
The transformer needs to have low magnetic field because it's<br />
right next to the tubes.<br />
<br />
One aliexpress candidate is YHDC. If we reverse a 110V primary<br />
we need at least a 20VA rating to stay within spec for copper loss.<br />
That means a big transformer, and hum unless you shield.<br />
Specify 110V|110V primary and 15+15 secondary.<br />
Convenient available space in the plugin is 65x50x50mm.<br />
Here are YHDC 20VA transformers.<br />
<br />
PE5424E-M is PCB mount, 57x48x44mm. Not a toroid.<br />
The following don't fit.<br />
PE5424K-M PCB mount plus holes, 75x49x44mm.<br />
LKB5424-L bolt-down with wire leads, 75x43x50mm.<br />
PU3917B low-profile bolt-down, 68x55x33mm.<br />
PTC25 25VA PCB with hole toroid 60x60x38mm.<br />
<br />
SWITCHING POWER SUPPLY FOR 6DJ8<br />
<br />
Here's a $3 6W model. 51x24x19mm.<br />
Sanmim SM-PLG06A-24.<br />
Several stores sell this. Just search for "sanmim" or "sanmin" and grovel through the<br />
hundreds of hits for 24V and 5W or 6W.<br />
Bought at "Your Cee".<br />
<br />
>>> SUCCESS!<br />
<br />
Mounted in a steel box, with simple filtering on<br />
input (1K) and output lines (0.33uF), it causes<br />
barely perceptible trace thickening at 1mV.<br />
<br />
GRID BIAS INCREASE FOR 12AT7<br />
<br />
Applied to S/N 2369 and 7111<br />
<br />
12AT7 is fine as-is in V124 and V114A/V214A, but V114B/V214B<br />
need an additional mod. Q154's Vce is the tube's grid bias.<br />
The 6DJ8 operates at -2.5V, which gives Q154 2V.<br />
The 12AT7 is only -0.5V, so Q154 starves.<br />
We must give the grids a positive offset.<br />
<br />
I tried a resistive divider (100K/100nF to 10Meg to +350V)<br />
This fails due to grid current from captured electrons,<br />
a normal phenomenon in low-bias tubes like the 12AT7.<br />
<br />
Batteries work. One CR2032 in series with R152/R252.<br />
Minus side to Q154 emitter, plus side to the resistor.<br />
Out of RF paranoia I put a cap across each battery.<br />
100nF axial-lead MLCC fits in the small space.<br />
Ig varies from 10uA to 70uA depending on the tube.<br />
Since current is drawn only while the instrument is running,<br />
the batteries should last for their shelf life, but I put<br />
them in insulated wire-lead holders to make replacement easy<br />
and to keep them from shorting. The batteries dangle below<br />
the ceramic strips to minimize stray capacitance.<br />
I unsoldered 5 terminals (silver-bearing solder!) and<br />
levered parts and wires out of the way to reach R152/R252.<br />
It's easier than it sounds. The grid bias mod is necessary<br />
for the 12AT7, but it's compatible with all tube types.<br />
<br />
End of ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416</div>Vintage davehttps://w140.com/tekwiki/index.php?title=W/Repairs&diff=74824W/Repairs2022-05-10T20:47:33Z<p>Vintage dave: formatting</p>
<hr />
<div>ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416<br />
<br />
It's common to find a Type W plugin missing its three type 8416 electron tubes.<br />
<br />
The 8416 is the industrial version of the 12DJ8. 8416 and 12DJ8<br />
are crazy-expensive when you can find them at all. It's possible to<br />
modify Type W to use 6DJ8 (the 6V version of 12DJ8), which is expensive<br />
but readily available.<br />
<br />
Studying datasheets, I found that under the conditions<br />
in Type W, 12AT7 has almost the same gm and rp as 6DJ8.<br />
The 12AT7 is cheap and abundant.<br />
<br />
I have three Type W's. I modded serial number 7465 to use 6DJ8,<br />
and 7111 and 2369 to use 12AT7. In each case, I calibrated<br />
before the mod using my three precious 8416's, and again<br />
after the mod. Two instruments failed on bandwidth.<br />
(2369 spec is 23MHz, actual is 21MHz. 7111 spec is 26MHz,<br />
actual is 25MHz.) But they did no better with 8416's;<br />
performance is equal with 6DJ8 and slightly better with 12AT7.<br />
<br />
The two mods are about equal in difficulty.<br />
The instrument should be calibrated after either mod.<br />
<br />
1. 6DJ8/6922/ECC88/E88CC/7DJ8/PCC88<br />
<br />
NOTE: These types are often advertised as identical,<br />
but their heater current is different. You can use any<br />
type but you can't mix them. Adjust the series resistor<br />
and current supply for the type you use. The numbers<br />
below are for 6DJ8.<br />
<br />
The 6DJ8's heater is half the voltage (6.3V) and twice the<br />
current (365mA). It requires series resistance to drop the<br />
extra 19V, and a power supply for the extra current. The<br />
supply must be isolated and electrically quiet.<br />
<br />
You might think you could just wire them in parallel and<br />
run off 6.3VAC but some mainframes elevate that rail to<br />
+100V, which will put an uncomfortable 200V between heater<br />
and cathode on V124. Besides, Tek used DC to avoid hum.<br />
<br />
A) Add 100 ohm 5W in series with R290. I put it on a<br />
three-point terminal strip bolted to the top of R290.<br />
<br />
B) Add isolated current source across V124-V214-V114.<br />
Start with either a 6V-24V step-up transformer (details below),<br />
rectifier and reservoir, or a shielded switching supply powered<br />
by +350V. The current regulator is just an LM317 with a<br />
resistor between OUT and ADJUST, and take output from ADJUST.<br />
Two 1/4W resistors in parallel, one 18 ohm, the other 12 ohm,<br />
gives 180mA, raising the total to 360mA. Or two 15's and a 100.<br />
<br />
The supply must handle 100V backfeed if a tube burns out.<br />
Just put a diode in series. That's why I regulate current<br />
instead of voltage.<br />
<br />
2. 12AT7<br />
<br />
A) Add 1200 ohm 2W in parallel with V124-V214-V114. This<br />
bypasses 30mA around the tubes, reducing the heater current<br />
from 180mA to 150mA.<br />
<br />
B) Tek used XV214 pin 9 as a tie point. It must float when<br />
12AT7 is used, because it's heater center-tap.<br />
<br />
C) V114B and V214B grids must be biased 3V positive for<br />
successful operation of the Q154-12AT7 cascode.<br />
Details below.<br />
<br />
3. OTHER TYPES - NOT TESTED<br />
<br />
12AZ7 requires supplement and grid bias. Curves == 12AT7. Meets Vhk.<br />
12BZ7 requires supplement and grid bias. Meets Vhk.<br />
12DT8 requires shunt R and grid bias. Curves == 12AT7.<br />
6BQ7/6BZ7/6BS8/8BQ7A require series R + supplement + grid bias.<br />
<br />
HEATER-CATHODE BREAKDOWN<br />
<br />
Most types exceed their Vhk spec. Including 8416 itself, assuming<br />
it's the same as 6DJ8. If Tek can ignore it so can we, I guess.<br />
<br />
TUBE TYPES THAT DO NOT WORK<br />
<br />
12AU7 <br />
12AV7<br />
12AX7<br />
12AY7<br />
12BH7<br />
<br />
EFFECT OF V124 HEATER-CATHODE SHORT<br />
<br />
R126 will smoke.<br />
Cathode may arc to grid but I don't see it burning anything.<br />
Stuff downstream might get hot.<br />
<br />
TRANSFORMER POWER SUPPLY FOR 6DJ8<br />
<br />
I used 120-0252-00, which is used in Type 3T77 and 3T77A.<br />
I have several. The best position is the rear bulkhead upper<br />
right corner with the long axis vertical. I can't see any hum<br />
at 1mV and line triggering. I put the rectifier/cap/regulator<br />
on the rear bulkhead to the left of the transformer, securing<br />
the rectifier and cap with hot glue to facilitate short leads.<br />
I strung the diode between the cap and the LM317 to avoid a tie point.<br />
With 200uF/50V (two 100's in parallel), I see 4V peak to peak ripple<br />
at IN, with the trough 8V above OUT. It's a symmetrical triangle wave.<br />
I heat-sinked the LM317 to the rear bulkhead, with a mica insulator.<br />
<br />
Maybe can use 120-0481-00, used in Type 1A4. It has a 20V winding<br />
that puts out 135mA, should be okay at 180mA since the other<br />
winding won't be used.<br />
<br />
120-0177-00 (used in Type Z) is 6V-6V so it's no good.<br />
<br />
Maybe a 110V-36V transformer on pins 13-14 with<br />
primary and secondary reversed, rectifier, filter, and LM317.<br />
The transformer needs to have low magnetic field because it's<br />
right next to the tubes.<br />
<br />
One aliexpress candidate is YHDC. If we reverse a 110V primary<br />
we need at least a 20VA rating to stay within spec for copper loss.<br />
That means a big transformer, and hum unless you shield.<br />
Specify 110V|110V primary and 15+15 secondary.<br />
Convenient available space in the plugin is 65x50x50mm.<br />
Here are YHDC 20VA transformers.<br />
<br />
PE5424E-M is PCB mount, 57x48x44mm. Not a toroid.<br />
The following don't fit.<br />
PE5424K-M PCB mount plus holes, 75x49x44mm.<br />
LKB5424-L bolt-down with wire leads, 75x43x50mm.<br />
PU3917B low-profile bolt-down, 68x55x33mm.<br />
PTC25 25VA PCB with hole toroid 60x60x38mm.<br />
<br />
SWITCHING POWER SUPPLY FOR 6DJ8<br />
<br />
Here's a $3 6W model. 51x24x19mm.<br />
Sanmim SM-PLG06A-24.<br />
Several stores sell this. Just search for "sanmim" or "sanmin" and grovel through the<br />
hundreds of hits for 24V and 5W or 6W.<br />
Bought at "Your Cee".<br />
<br />
>>> SUCCESS!<br />
<br />
Mounted in a steel box, with simple filtering on<br />
input (1K) and output lines (0.33uF), it causes<br />
barely perceptible trace thickening at 1mV.<br />
<br />
GRID BIAS INCREASE FOR 12AT7<br />
<br />
Applied to S/N 2369 and 7111<br />
<br />
12AT7 is fine as-is in V124 and V114A/V214A, but V114B/V214B<br />
need an additional mod. Q154's Vce is the tube's grid bias.<br />
The 6DJ8 operates at -2.5V, which gives Q154 2V.<br />
The 12AT7 is only -0.5V, so Q154 starves.<br />
We must give the grids a positive offset.<br />
<br />
I tried a resistive divider (100K/100nF to 10Meg to +350V)<br />
This fails due to grid current from captured electrons,<br />
a normal phenomenon in low-bias tubes like the 12AT7.<br />
<br />
Batteries work. One CR2032 in series with R152/R252.<br />
Minus side to Q154 emitter, plus side to the resistor.<br />
Out of RF paranoia I put a cap across each battery.<br />
100nF axial-lead MLCC fits in the small space.<br />
Ig varies from 10uA to 70uA depending on the tube.<br />
Since current is drawn only while the instrument is running,<br />
the batteries should last for their shelf life, but I put<br />
them in insulated wire-lead holders to make replacement easy<br />
and to keep them from shorting. The batteries dangle below<br />
the ceramic strips to minimize stray capacitance.<br />
I unsoldered 5 terminals (silver-bearing solder!) and<br />
levered parts and wires out of the way to reach R152/R252.<br />
It's easier than it sounds. The grid bias mod is necessary<br />
for the 12AT7, but it's compatible with all tube types.<br />
<br />
End of ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416</div>Vintage davehttps://w140.com/tekwiki/index.php?title=W/Repairs&diff=74823W/Repairs2022-05-10T20:27:33Z<p>Vintage dave: ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416</p>
<hr />
<div>ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416<br />
<br />
It's common to find a Type W plugin missing its three type 8416 electron tubes.<br />
<br />
The 8416 is the industrial version of the 12DJ8. 8416 and 12DJ8<br />
are crazy-expensive when you can find them at all. It's possible to<br />
modify Type W to use 6DJ8 (the 6V version of 12DJ8), which is expensive<br />
but readily available.<br />
<br />
Studying datasheets, I found that under the conditions<br />
in Type W, 12AT7 has almost the same gm and rp as 6DJ8.<br />
The 12AT7 is cheap and abundant.<br />
<br />
I have three Type W's. I modded serial number 7465 to use 6DJ8,<br />
and 7111 and 2369 to use 12AT7. In each case, I calibrated<br />
before the mod using my three precious 8416's, and again<br />
after the mod. Two instruments failed on bandwidth.<br />
(2369 spec is 23MHz, actual is 21MHz. 7111 spec is 26MHz,<br />
actual is 25MHz.) But they did no better with 8416's;<br />
performance is equal with 6DJ8 and slightly better with 12AT7.<br />
<br />
The two mods are about equal in difficulty.<br />
The instrument should be calibrated after either mod.<br />
<br />
1. 6DJ8/6922/ECC88/E88CC/7DJ8/PCC88<br />
<br />
NOTE: These types are often advertised as identical,<br />
but their heater current is different. You can use any<br />
type but you can't mix them. Adjust the series resistor<br />
and current supply for the type you use. The numbers<br />
below are for 6DJ8.<br />
<br />
The 6DJ8's heater is half the voltage (6.3V) and twice the<br />
current (365mA). It requires series resistance to drop the<br />
extra 19V, and a power supply for the extra current. The<br />
supply must be isolated and electrically quiet.<br />
<br />
You might think you could just wire them in parallel and<br />
run off 6.3VAC but some mainframes elevate that rail to<br />
+100V, which will put an uncomfortable 200V between heater<br />
and cathode on V124. Besides, Tek used DC to avoid hum.<br />
<br />
A) Add 100 ohm 5W in series with R290. I put it on a<br />
three-point terminal strip bolted to the top of R290.<br />
<br />
B) Add isolated current source across V124-V214-V114.<br />
Start with either a 6V-24V step-up transformer (details below),<br />
rectifier and reservoir, or a shielded switching supply powered<br />
by +350V. The current regulator is just an LM317 with a<br />
resistor between OUT and ADJUST, and take output from ADJUST.<br />
Two 1/4W resistors in parallel, one 18 ohm, the other 12 ohm,<br />
gives 180mA, raising the total to 360mA. Or two 15's and a 100.<br />
<br />
The supply must handle 100V backfeed if a tube burns out.<br />
Just put a diode in series. That's why I regulate current<br />
instead of voltage.<br />
<br />
2. 12AT7<br />
<br />
A) Add 1200 ohm 2W in parallel with V124-V214-V114. This<br />
bypasses 30mA around the tubes, reducing the heater current<br />
from 180mA to 150mA.<br />
<br />
B) Tek used XV214 pin 9 as a tie point. It must float when<br />
12AT7 is used, because it's heater center-tap.<br />
<br />
C) V114B and V214B grids must be biased 3V positive for<br />
successful operation of the Q154-12AT7 cascode.<br />
Details below.<br />
<br />
3. OTHER TYPES - NOT TESTED<br />
<br />
12AZ7 requires supplement and grid bias. Curves == 12AT7. Meets Vhk.<br />
12BZ7 requires supplement and grid bias. Meets Vhk.<br />
12DT8 requires shunt R and grid bias. Curves == 12AT7.<br />
6BQ7/6BZ7/6BS8/8BQ7A require series R + supplement + grid bias.<br />
<br />
HEATER-CATHODE BREAKDOWN<br />
<br />
Most types exceed their Vhk spec. Including 8416 itself, assuming<br />
it's the same as 6DJ8. If Tek can ignore it so can we, I guess.<br />
<br />
TUBE TYPES THAT DO NOT WORK<br />
<br />
12AU7 <br />
12AV7<br />
12AX7<br />
12AY7<br />
12BH7<br />
<br />
EFFECT OF V124 HEATER-CATHODE SHORT<br />
<br />
R126 will smoke.<br />
Cathode may arc to grid but I don't see it burning anything.<br />
Stuff downstream might get hot.<br />
<br />
TRANSFORMER POWER SUPPLY FOR 6DJ8<br />
<br />
I used 120-0252-00, which is used in Type 3T77 and 3T77A.<br />
I have several. The best position is the rear bulkhead upper<br />
right corner with the long axis vertical. I can't see any hum<br />
at 1mV and line triggering. I put the rectifier/cap/regulator<br />
on the rear bulkhead to the left of the transformer, securing<br />
the rectifier and cap with hot glue to facilitate short leads.<br />
I strung the diode between the cap and the LM317 to avoid a tie point.<br />
With 200uF/50V (two 100's in parallel), I see 4V peak to peak ripple<br />
at IN, with the trough 8V above OUT. It's a symmetrical triangle wave.<br />
I heat-sinked the LM317 to the rear bulkhead, with a mica insulator.<br />
<br />
Maybe can use 120-0481-00, used in Type 1A4. It has a 20V winding<br />
that puts out 135mA, should be okay at 180mA since the other<br />
winding won't be used.<br />
<br />
120-0177-00 (used in Type Z) is 6V-6V so it's no good.<br />
<br />
Maybe a 110V-36V transformer on pins 13-14 with<br />
primary and secondary reversed, rectifier, filter, and LM317.<br />
The transformer needs to have low magnetic field because it's<br />
right next to the tubes.<br />
<br />
One aliexpress candidate is YHDC. If we reverse a 110V primary<br />
we need at least a 20VA rating to stay within spec for copper loss.<br />
That means a big transformer, and hum unless you shield.<br />
Specify 110V|110V primary and 15+15 secondary.<br />
Convenient available space in the plugin is 65x50x50mm.<br />
Here are YHDC 20VA transformers.<br />
<br />
PE5424E-M is PCB mount, 57x48x44mm. Not a toroid.<br />
The following don't fit.<br />
PE5424K-M PCB mount plus holes, 75x49x44mm.<br />
LKB5424-L bolt-down with wire leads, 75x43x50mm.<br />
PU3917B low-profile bolt-down, 68x55x33mm.<br />
PTC25 25VA PCB with hole toroid 60x60x38mm.<br />
<br />
SWITCHING POWER SUPPLY FOR 6DJ8<br />
<br />
Here's a $3 6W model. 51x24x19mm.<br />
Sanmim SM-PLG06A-24.<br />
Several stores sell this. Just search for "sanmim" or "sanmin" and grovel through the<br />
hundreds of hits for 24V and 5W or 6W.<br />
Bought at "Your Cee".<br />
<br />
>>> SUCCESS!<br />
<br />
Mounted in a steel box, with simple filtering on<br />
input (1K) and output lines (0.33uF), it causes<br />
barely perceptible trace thickening at 1mV.<br />
<br />
GRID BIAS INCREASE FOR 12AT7<br />
<br />
Applied to S/N 2369 and 7111<br />
<br />
12AT7 is fine as-is in V124 and V114A/V214A, but V114B/V214B<br />
need an additional mod. Q154's Vce is the tube's grid bias.<br />
The 6DJ8 operates at -2.5V, which gives Q154 2V.<br />
The 12AT7 is only -0.5V, so Q154 starves.<br />
We must give the grids a positive offset.<br />
<br />
I tried a resistive divider (100K/100nF to 10Meg to +350V)<br />
This fails due to grid current from captured electrons,<br />
a normal phenomenon in low-bias tubes like the 12AT7.<br />
<br />
Batteries work. One CR2032 in series with R152/R252.<br />
Minus side to Q154 emitter, plus side to the resistor.<br />
Out of RF paranoia I put a cap across each battery.<br />
100nF axial-lead MLCC fits in the small space.<br />
Ig varies from 10uA to 70uA depending on the tube.<br />
Since current is drawn only while the instrument is running,<br />
the batteries should last for their shelf life, but I put<br />
them in insulated wire-lead holders to make replacement easy<br />
and to keep them from shorting. The batteries dangle below<br />
the ceramic strips to minimize stray capacitance.<br />
I unsoldered 5 terminals (silver-bearing solder!) and<br />
levered parts and wires out of the way to reach R152/R252.<br />
It's easier than it sounds. The grid bias mod is necessary<br />
for the 12AT7, but it's compatible with all tube types.<br />
<br />
End of ADAPTING THE TYPE W PLUGIN TO USE 6DJ8 or 12AT7 INSTEAD OF 8416</div>Vintage davehttps://w140.com/tekwiki/index.php?title=W&diff=74822W2022-05-10T20:26:43Z<p>Vintage dave: 8416 not 6DJ8</p>
<hr />
<div>{{Plugin Sidebar <br />
|manufacturer=Tektronix<br />
|series=500-series scopes<br />
|type=Type W <br />
|summary=8-23 MHz differential comparator <br />
|image=type w front.jpg <br />
|caption=Type W front view<br />
|introduced=1965<br />
|discontinued=1974<br />
|designers=John Horn <br />
|manuals=<br />
* [[Media:070-432.pdf|Tektronix Type W Manual]] (11MB)<br />
* [[Media:070-432_Schematic_SN3270up.pdf|Tektronix Type W Schematics Color for SN 3270 up]] (10MB)<br />
* [[Media:070-1109-00.pdf|Tektronix Type W SN 7000-up Manual]] (OCR)<br />
* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969]] (needs OCR)<br />
* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969]] (needs OCR)<br />
* [[Media:Tek type w cal outline.pdf|Tektronix Type W Calibration Outline]] (OCR)<br />
<!--<br />
* [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)]<br />
* [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)]<br />
* [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]]<br />
--><br />
}}<br />
The '''Tektronix Type W''' is a differential comparator plug-in amplifier for [[500-series scopes]], designed by [[John Horn]].<br />
<br />
{{BeginSpecs}}<br />
{{Spec | Deflection | 1 mV/Div to 50 V/Div, 1–2–5 (6-position) and 4-position decade attenuator }}<br />
{{Spec | Input impedance | 1 MΩ // 20 pF (either input) }}<br />
{{Spec | Bandwidth | 26 MHz (23 MHz below S/N 7000) @ 50 mV/cm; 8 MHz @ 1 mV/cm }}<br />
{{Spec | Common Mode Range | ±15 V after INPUT ATTEN }}<br />
{{Spec | CMRR | DC Coupled: 20000:1 DC to 20 kHz, 500:1 at 500 kHz; AC Coupled: 1000:1 at 60 Hz }}<br />
{{Spec | Signal ranges | }}<br />
<br />
{| class="wikitable" border=1 style="margin-left: 8em;" |<br />
!Maximum Input Voltage (S/N 7000-up)<br />
|-<br />
| DC Coupled || 350 V<br />
|-<br />
| AC Coupled || 500 V<br />
|-<br />
!Maximum Input Voltage (S/N 101-6999)<br />
|-<br />
| INPUT ATTEN = 1 || 15 V<br />
|-<br />
| INPUT ATTEN = 10 || 150 V<br />
|-<br />
| INPUT ATTEN = 100 || ±350 V (DC Coupled); 500 V (AC Coupled)<br />
|-<br />
| INPUT ATTEN = 1000 || ±350 V (DC Coupled); 500 V (AC Coupled)<br />
|-<br />
|}<br />
<br />
Type W is faster (bandwidth 23 MHz to 8 MHz depending on gain) than its [[Z|Type Z]] predecessor, and it extends performance in terms of sensitivity, reaching 1 mV/div. <br />
It achieves 20,000 to 1 common-mode rejection at DC and low frequencies.<br />
<br />
{{EndSpecs}}<br />
<br />
==Operation==<br />
Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V<sub>C</sub>", <br />
which is controlled by a ten-turn pot and can vary from either −1.1 V to +1.1 V or −11 V to +11 V. <br />
A mode switch selects between displaying A−V<sub>C</sub>, A−B, or V<sub>C</sub>−B. <br />
The "A−B" mode is particularly useful for displaying the current in a sense resistor, <br />
while the other modes provide "slideback" measurements of small variations superimposed on a large constant. <br />
An output of V<sub>C</sub> is provided on the front panel for precision measurements. <br />
<br />
Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector, reminiscent of [[D|Type D]] from ten years before.<br />
<br />
Type W is the only letter-series plug-in with an "infinite resistance" input mode selectable at the front panel.<br />
(Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.)<br />
<br />
Early production Type W in a [[556]] mainframe won't meet spec for overdrive recovery time, because an overdriven W passes enough common-mode to the mainframe vertical amp to saturate it. <br />
At S/N 3270, this was fixed, by adding another stage to attenuate CM. The new "output amp" circuit board clips onto the rear bulkhead; significant hand mods are required on the chassis.<br />
This was also offered as Modification kit 040-0447-00 to retrofit existing instruments.<br />
<br />
Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971 (S/N 7000), following the lead of Type [[1A7]], the Nuvistors were replaced by JFETs to reduce drift. <br />
Mod kit 040-0590-00 was offered for existing instruments.<br />
<br />
In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]].<br />
<br />
Type W uses three type [[8416]] tubes, the 12V version of the [[6DJ8]].<br />
<br />
==Pictures==<br />
<gallery><br />
Type_w_front.jpg|Front view.<br />
Type_w_topleft.jpg|Top-left view. <br />
Type_w_bottom.jpg|Bottom view.<br />
Tek w block.png|Block Diagram<br />
Tek w differential comparator.png|Differential Comparator, initial version<br />
Tek w input attenuators.png|Input Attenuators<br />
Tek w switching diagram.png|Switching Diagram<br />
Tek type w a phase 1.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 2.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 3.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 4.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 5.jpg|A-phase (prototype) Type W<br />
</gallery><br />
<br />
{{Parts|W}}<br />
<br />
[[Category:500 series plugins]]<br />
[[Category:Differential amplifiers]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=1S1&diff=748211S12022-05-10T20:24:55Z<p>Vintage dave: 8416 not 6DJ8</p>
<hr />
<div>{{Plugin Sidebar <br />
|manufacturer=Tektronix <br />
|series=500-series scopes <br />
|type=1S1<br />
|summary=Sampling system<br />
|image=1s1 front details.JPG <br />
|caption=1S1 front view<br />
|introduced=1965 <br />
|discontinued=1974 <br />
|designers=Chuck Edgar<br />
|manuals=<br />
* [[Media:070-0475-00.pdf|Tektronix 1S1 Manual (PDF, retouched)]]<br />
* [http://bama.edebris.com/download/tek/1s1/1s1.djvu Tektronix 1S1 Manual (DjVu)]<br />
* [http://w140.com/1s1.pdf Tektronix 1S1 Manual (PDF)]<br />
* [[Media:tek_1s1_field_training_package.pdf|Tektronix 1S1 Field Training Package (PDF, OCR)]]<br />
<br />
* [[1S1/Repairs|David Wise 1S1 Repair Notes]]<br />
}}<br />
The '''Tektronix 1S1''' is a [[sampling oscilloscope|sampling]] plug-in for [[500-series scopes]], designed by [[Gene Cowan]] (vertical) and [[Chuck Edgar]] (horizontal), [[introduced in 1965]] and sold through 1973.<br />
<br />
It is essentially one channel of a sampling unit and a timing unit from a [[661]]. It has its own trigger and timebase. <br />
<br />
The oscilloscope's timebase is usually set to a relatively slow sweep rate when using a 1S1. Alternatively, the sweep <br />
on the oscilloscope can free-run, and the horizontal voltage from the oscilloscope can be used to control the 1S1, as described below. <br />
<br />
The 1S1 has a 50 Ω [[GR-874 connector]] for the signal input. The plug-in supplies power (+100 V and −12.6 V) to accessories like <br />
the [[P6032]] Cathode Follower Probe, the [[281]] TDR Pulser, and the [[282|Type 282 Probe Adapter]], which is an active buffer to <br />
allow the use of high-impedance probes with the 50 Ω input of the 1S1 (at reduced bandwidth).<br />
<br />
{{MissingSpecs}}<br />
<br />
==Operation==<br />
The 1S1 can operate in normal self-swept mode or an external sweep signal can be applied to the 1S1. <br />
With the 1S1's internal sweep disabled, the horizontal-in and vertical-out connections can be used <br />
so the 1S1 acts as a lookup table, a mapping of X to Y, a function. <br />
The 661 also has this capability, in its "A vert/B horiz" mode, which is like X-Y mode for a sampler. <br />
In this mode, the horizontal-in voltage controls the time after the trigger event when the sample should be taken, <br />
and the vertical-out voltage corresponds to the voltage measured at that instant. <br />
This allows a waveform to be digitized using an arbitrarily slow DAC to generate the horizontal voltage <br />
and ADC to read the sampled output. But perhaps more importantly, by setting a constant horizontal-in voltage, <br />
it allows the output signal at one equivalent time instant to be processed in the time domain. <br />
For example, this allows the voltage to be low-pass filtered, so that it can be more accurately measured. <br />
The other reason why one might want a signal that consists of multiple sequential measurements <br />
of the same equivalent-time instant is that statistics can be calculated on these observations. <br />
For example, one might want to know, when testing a logic gate, what is the propagation delay <br />
such that 99.9% of the transitions happen faster than this. <br />
<br />
The horizontal-in voltage can also be produced, in "manual" mode, by setting a knob on the 1S1.<br />
<br />
When the 1S1 is set for INT trigger signal, the EXT TRIG input is terminated with 50 Ω.<br />
<br />
==Internals==<br />
The sampler in the 1S1 is quite different from the sampler in the [[1S2]]. The 1S1 uses a [[sampling diodes|four-diode]] sampling bridge, terminated within the 1S1. The 1S2 uses a two-diode feed-through sampler, typical for TDR instruments.<br />
<br />
The 1S1 uses two type [[8416]] tubes, the 12V version of the [[6DJ8]].<br />
<br />
==Pictures==<br />
<br />
<gallery><br />
Tek 1s1.jpg|Front view<br />
Tek_1S1_Iso.jpeg | 1S1<br />
Tek_1S1_Front.jpeg | Front<br />
1s1 front details.JPG | Front<br />
Tek_1S1_RHS.jpeg | LHS <br />
Tek_1S1_LHS.jpeg | RHS<br />
Tek_1S1_Top.jpeg | Top<br />
Tek_1S1_Bottom.jpeg | Bottom<br />
1s1 front.jpg<br />
1s1 left.jpg<br />
1s1 right.jpg<br />
Tek 1s1 rear.jpg|Rear<br />
Tek 1s1 rear2.jpg|Rear<br />
Tek_1S1_Delayline.jpeg | Delay Line<br />
1s1 block.jpg|block diagram<br />
</gallery><br />
<br />
{{Parts|1S1}}<br />
<br />
[[Category:Sampling plugins]]<br />
[[Category:500 series plugins]]<br />
[[Category:GR874]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=6DJ8&diff=748206DJ82022-05-10T20:23:02Z<p>Vintage dave: different approach, keep 8416 under 6dj8 umbrella and add notes in instrument pages</p>
<hr />
<div>[[File:Telefunken 6dj8 ecc88.jpg|thumb|300px|right|6DJ8 Tube]]<br />
{{Vacuum Tube<br />
|Type=Double Triode<br />
|Number=6DJ8<br />
|EuroNumber=ECC88<br />
|Part_nos=154-0305-00;154-0195-00;154-0413-00<br />
|Description=dual triode<br />
|Used_in=132;502;502A;503;504;515;516;519;533;535;543;544;545;545A;545B;546;547;549;555;556;565;581;581A;585;585A;661;2A60;2A63;3A8;1121;1A4;67;81;82;86;3B1;3B4;1S1;B;O;W;Z;Telequipment S32A;Telequipment D52;Telequipment S52;Telequipment S51;Telequipment Type A;<br />
|Designers=<br />
}} with a 6.3 V, 365 mA heater and a {{B9A base}}. <br />
<br />
The high-reliability version is the '''6922''' aka '''E88CC''' (Tek P/N 154-0371-00) or '''8416''' (with 12.6 V 180 mA heater).<br />
<br />
With 15 mA of plate current, 90 V plate-to-cathode voltage, and −1.3 V grid-to-cathode, the 6DJ8 provides 12.5 mS of transconductance with a plate resistance of about 2.5 kΩ. <br />
<br />
The 6DJ8 and its variants are used extensively in many Tektronix instruments of the tube era.<br />
<br />
As of 2021, 6DJ8 tubes are still manufactured and used and new old stock (NOS) 6DJ8s can also be obtained easily. <br />
The 6DJ8 is sought after by the tube audio community, leading to exaggerated prices and occasional cannibalism of classic Tek gear.<br />
<br />
Tek part numbers: <br />
* 154-0305-00 = 6DJ8<br />
* 154-0195-00 = 6922<br />
* 154-0413-00 = 8416<br />
<br />
{| class="wikitable"<br />
{{Checkedtubes TableHeader}}<br />
|- <br />
| [[1121]] (V424) || 157-0060-00 || All<br />
|- <br />
| [[519]] (V184,V194) || 157-0060-00 || All <br />
|- <br />
| [[503]] (V334,V434) || 157-0066-00 || Upto-6977<br />
|- <br />
| [[2A63]] (V334,V434) || 157-0066-00 || Upto-7660<br />
|- <br />
| [[3A8]] || 157-0116-00 (8416) || All<br />
|- <br />
| [[2A63]] || 157-0120-00 || 7660-Up<br />
|- <br />
| Unknown || 157-0122-00 || N/A<br />
|- <br />
| [[544]], [[546]], [[547]], [[556]] || 157-0125-00 || N/A<br />
|}<br />
<br />
{{Tube aging reference}}<br />
<br />
==Links==<br />
* [[tube:6dj8|6DJ8]] / [[tube:ecc88|ECC88]] / [[tube:6922|6922]] / [[tube:e88cc|E88CC]] / [[tube:8416|8416]] @ radiomuseum.org<br />
* [[wikipedia:6DJ8|6DJ8 @ Wikipedia]]<br />
<br />
==Data sheet==<br />
<gallery> 6dj8.png | 6DJ8 tube data</gallery><br />
== Pictures ==<br />
<gallery><br />
585-distamp-operating.jpg | delay line driver distributed amplifier in [[585]] in operation − seven 6DJ8 differential stages<br />
6DJ8_BB-Tube.jpg | 6DJ8 Bugle Boy Tube from a 535<br />
Four amperex 6dj8 tubes.jpg|Amperex 6DJ8 Tubes<br />
</gallery><br />
<br />
<br />
[[Category:Triodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=6DJ8&diff=748196DJ82022-05-10T20:19:34Z<p>Vintage dave: W uses 8416 not 6DJ8</p>
<hr />
<div>[[File:Telefunken 6dj8 ecc88.jpg|thumb|300px|right|6DJ8 Tube]]<br />
{{Vacuum Tube<br />
|Type=Double Triode<br />
|Number=6DJ8<br />
|EuroNumber=ECC88<br />
|Part_nos=154-0305-00;154-0195-00;154-0413-00<br />
|Description=dual triode<br />
|Used_in=132;502;502A;503;504;515;516;519;533;535;543;544;545;545A;545B;546;547;549;555;556;565;581;581A;585;585A;661;2A60;2A63;3A8;1121;1A4;67;81;82;86;3B1;3B4;B;O;Z;Telequipment S32A;Telequipment D52;Telequipment S52;Telequipment S51;Telequipment Type A;<br />
|Designers=<br />
}} with a 6.3 V, 365 mA heater and a {{B9A base}}. <br />
<br />
The high-reliability version is the '''6922''' aka '''E88CC''' (Tek P/N 154-0371-00) or '''8416''' (with 12.6 V 180 mA heater).<br />
<br />
With 15 mA of plate current, 90 V plate-to-cathode voltage, and −1.3 V grid-to-cathode, the 6DJ8 provides 12.5 mS of transconductance with a plate resistance of about 2.5 kΩ. <br />
<br />
The 6DJ8 and its variants are used extensively in many Tektronix instruments of the tube era.<br />
<br />
As of 2021, 6DJ8 tubes are still manufactured and used and new old stock (NOS) 6DJ8s can also be obtained easily. <br />
The 6DJ8 is sought after by the tube audio community, leading to exaggerated prices and occasional cannibalism of classic Tek gear.<br />
<br />
Tek part numbers: <br />
* 154-0305-00 = 6DJ8<br />
* 154-0195-00 = 6922<br />
* 154-0413-00 = 8416<br />
<br />
{| class="wikitable"<br />
{{Checkedtubes TableHeader}}<br />
|- <br />
| [[1121]] (V424) || 157-0060-00 || All<br />
|- <br />
| [[519]] (V184,V194) || 157-0060-00 || All <br />
|- <br />
| [[503]] (V334,V434) || 157-0066-00 || Upto-6977<br />
|- <br />
| [[2A63]] (V334,V434) || 157-0066-00 || Upto-7660<br />
|- <br />
| [[3A8]] || 157-0116-00 (8416) || All<br />
|- <br />
| [[2A63]] || 157-0120-00 || 7660-Up<br />
|- <br />
| Unknown || 157-0122-00 || N/A<br />
|- <br />
| [[544]], [[546]], [[547]], [[556]] || 157-0125-00 || N/A<br />
|}<br />
<br />
{{Tube aging reference}}<br />
<br />
==Links==<br />
* [[tube:6dj8|6DJ8]] / [[tube:ecc88|ECC88]] / [[tube:6922|6922]] / [[tube:e88cc|E88CC]] / [[tube:8416|8416]] @ radiomuseum.org<br />
* [[wikipedia:6DJ8|6DJ8 @ Wikipedia]]<br />
<br />
==Data sheet==<br />
<gallery> 6dj8.png | 6DJ8 tube data</gallery><br />
== Pictures ==<br />
<gallery><br />
585-distamp-operating.jpg | delay line driver distributed amplifier in [[585]] in operation − seven 6DJ8 differential stages<br />
6DJ8_BB-Tube.jpg | 6DJ8 Bugle Boy Tube from a 535<br />
Four amperex 6dj8 tubes.jpg|Amperex 6DJ8 Tubes<br />
</gallery><br />
<br />
<br />
[[Category:Triodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=6DJ8&diff=748186DJ82022-05-10T19:47:06Z<p>Vintage dave: 8416 is 180mA heater</p>
<hr />
<div>[[File:Telefunken 6dj8 ecc88.jpg|thumb|300px|right|6DJ8 Tube]]<br />
{{Vacuum Tube<br />
|Type=Double Triode<br />
|Number=6DJ8<br />
|EuroNumber=ECC88<br />
|Part_nos=154-0305-00;154-0195-00;154-0413-00<br />
|Description=dual triode<br />
|Used_in=132;502;502A;503;504;515;516;519;533;535;543;544;545;545A;545B;546;547;549;555;556;565;581;581A;585;585A;661;2A60;2A63;3A8;1121;1A4;67;81;82;86;3B1;3B4;B;O;W;Z;Telequipment S32A;Telequipment D52;Telequipment S52;Telequipment S51;Telequipment Type A;<br />
|Designers=<br />
}} with a 6.3 V, 365 mA heater and a {{B9A base}}. <br />
<br />
The high-reliability version is the '''6922''' aka '''E88CC''' (Tek P/N 154-0371-00) or '''8416''' (with 12.6 V 180 mA heater).<br />
<br />
With 15 mA of plate current, 90 V plate-to-cathode voltage, and −1.3 V grid-to-cathode, the 6DJ8 provides 12.5 mS of transconductance with a plate resistance of about 2.5 kΩ. <br />
<br />
The 6DJ8 and its variants are used extensively in many Tektronix instruments of the tube era.<br />
<br />
As of 2021, 6DJ8 tubes are still manufactured and used and new old stock (NOS) 6DJ8s can also be obtained easily. <br />
The 6DJ8 is sought after by the tube audio community, leading to exaggerated prices and occasional cannibalism of classic Tek gear.<br />
<br />
Tek part numbers: <br />
* 154-0305-00 = 6DJ8<br />
* 154-0195-00 = 6922<br />
* 154-0413-00 = 8416<br />
<br />
{| class="wikitable"<br />
{{Checkedtubes TableHeader}}<br />
|- <br />
| [[1121]] (V424) || 157-0060-00 || All<br />
|- <br />
| [[519]] (V184,V194) || 157-0060-00 || All <br />
|- <br />
| [[503]] (V334,V434) || 157-0066-00 || Upto-6977<br />
|- <br />
| [[2A63]] (V334,V434) || 157-0066-00 || Upto-7660<br />
|- <br />
| [[3A8]] || 157-0116-00 (8416) || All<br />
|- <br />
| [[2A63]] || 157-0120-00 || 7660-Up<br />
|- <br />
| Unknown || 157-0122-00 || N/A<br />
|- <br />
| [[544]], [[546]], [[547]], [[556]] || 157-0125-00 || N/A<br />
|}<br />
<br />
{{Tube aging reference}}<br />
<br />
==Links==<br />
* [[tube:6dj8|6DJ8]] / [[tube:ecc88|ECC88]] / [[tube:6922|6922]] / [[tube:e88cc|E88CC]] / [[tube:8416|8416]] @ radiomuseum.org<br />
* [[wikipedia:6DJ8|6DJ8 @ Wikipedia]]<br />
<br />
==Data sheet==<br />
<gallery> 6dj8.png | 6DJ8 tube data</gallery><br />
== Pictures ==<br />
<gallery><br />
585-distamp-operating.jpg | delay line driver distributed amplifier in [[585]] in operation − seven 6DJ8 differential stages<br />
6DJ8_BB-Tube.jpg | 6DJ8 Bugle Boy Tube from a 535<br />
Four amperex 6dj8 tubes.jpg|Amperex 6DJ8 Tubes<br />
</gallery><br />
<br />
<br />
[[Category:Triodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Turret_attenuators&diff=73899Turret attenuators2022-03-28T03:31:26Z<p>Vintage dave: heat sensitivity</p>
<hr />
<div>In a '''Turret attenuator''', individual R/C attenuator elements are rotated within a cylindrical housing whereas the external contacts stay stationary.<br />
<br />
They were used in the [[H|Type H]], [[Z|Type Z]], [[516]], and [[1121]] and are known to give trouble in the form of intermittent electrical continuity at the contacts.<br />
Also, the plastic used in the turrets is easily melted if a soldering iron gets anywhere near it.<br />
<br />
<gallery><br />
Tek 1121 turret attenuator.jpg|Turret attenuator of a [[1121]]<br />
Tek 516 turret.jpg | [[516]]<br />
Tek_z_turret.png | Type Z attenuators circuits<br />
</gallery><br />
<br />
[[Category:Electromechanical components]]<br />
[[Category:Repair issues]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=RCA_40250&diff=72708RCA 402502022-02-11T18:25:52Z<p>Vintage dave: hometaxial</p>
<hr />
<div>The '''RCA 40250''' is a 50V, 4A diffused-junction ("hometaxial") silicon NPN bipolar transistor in a TO-66 package.<br />
<br />
The Tektronix part number for this transistor is 151-0148-00.<br />
It is used as the output pass transistor in the positive and negative regulators of the [[015-0073-00]], and in Type [[1S1]] and many other instruments.<br />
<br />
<gallery><br />
Rca 40250 1.jpg<br />
Rca 40250 2.jpg<br />
Rca 40250 3.jpg<br />
Rca 40250 4.jpg<br />
</gallery><br />
<br />
[[Category:Transistors]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Talk:RCA_40250&diff=72707Talk:RCA 402502022-02-11T18:25:31Z<p>Vintage dave: Created page with "The 1978 RCA Power Devices databook shows alternate part numbers 2N3054, 2N6260, 2N6261."</p>
<hr />
<div>The 1978 RCA Power Devices databook shows alternate part numbers 2N3054, 2N6260, 2N6261.</div>Vintage davehttps://w140.com/tekwiki/index.php?title=RCA_40250&diff=72706RCA 402502022-02-11T18:21:39Z<p>Vintage dave: major specs</p>
<hr />
<div>The '''RCA 40250''' is a 50V, 4A diffused-junction silicon NPN bipolar transistor in a TO-66 package.<br />
<br />
The Tektronix part number for this transistor is 151-0148-00.<br />
It is used as the output pass transistor in the positive and negative regulators of the [[015-0073-00]], and in Type [[1S1]] and many other instruments.<br />
<br />
<gallery><br />
Rca 40250 1.jpg<br />
Rca 40250 2.jpg<br />
Rca 40250 3.jpg<br />
Rca 40250 4.jpg<br />
</gallery><br />
<br />
[[Category:Transistors]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=RCA_40250&diff=72705RCA 402502022-02-11T18:05:18Z<p>Vintage dave: other uses</p>
<hr />
<div>The '''RCA 40250''' is a diffused-junction silicon NPN bipolar transistor in a TO-66 package.<br />
<br />
The Tektronix part number for this transistor is 151-0148-00.<br />
It is used as the output pass transistor in the positive and negative regulators of the [[015-0073-00]], and in Type [[1S1]] and many other instruments.<br />
<br />
<gallery><br />
Rca 40250 1.jpg<br />
Rca 40250 2.jpg<br />
Rca 40250 3.jpg<br />
Rca 40250 4.jpg<br />
</gallery><br />
<br />
[[Category:Transistors]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=RCA_40250&diff=72704RCA 402502022-02-11T17:47:15Z<p>Vintage dave: to-66</p>
<hr />
<div>The '''RCA 40250''' is a diffused-junction silicon NPN bipolar transistor in a TO-66 package.<br />
<br />
The Tektronix part number for this transistor is 151-0148-00.<br />
It is used as the output pass transistor in the positive and negative regulators of the [[015-0073-00]].<br />
<br />
<gallery><br />
Rca 40250 1.jpg<br />
Rca 40250 2.jpg<br />
Rca 40250 3.jpg<br />
Rca 40250 4.jpg<br />
</gallery><br />
<br />
[[Category:Transistors]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Tunnel_Diode_Replacement_and_Modification&diff=72553Tunnel Diode Replacement and Modification2022-02-08T17:07:17Z<p>Vintage dave: schematic is in the manual; two S/N ranges</p>
<hr />
<div><br />
== Sweep Trigger TD Substitution ==<br />
<br />
''(This article originally found on Bill & Stan's Tektronix Resource Site by [[Stan Griffiths]], http://www.reprise.com/host/tektronix/reference/tunnel_diode.asp, retrieved on April 11, 2021 from the Wayback Machine's March 13, 2018 snapshot. The article itself was last modified on 9/11/04 7:18:10 PM)''<br />
<br />
[[Tunnel diodes]] are getting hard to find, although some types are more rare than others. Many Tektronix oscilloscopes use tunnel diodes in their sweep trigger circuits. When these diodes fail, the entire instrument is useless until you find a replacement. <br />
<br />
If you cannot find the Tunnel Diode you need, it it sometimes possible to use an alternate type. This page describes modifications that were performed on a Tektronix 547 sweep trigger circuit to use an available 4.7 mA Tunnel Diode in place of the impossible-to-find 10 mA original. <br />
<br />
Our thanks to Morris Odell, VK3DOC, who devised these modifications and has allowed us to share them with you here. <br />
<br />
Refer to the S/N 100-6739 547 A Sweep Trigger circuit diagram in the manual.<br />
<br />
Step by Step Modification Instructions: <br />
# Replace the bad 10 mA Tunnel Diode (D245) with a new 4.7 mA Tunnel Diode (e.g. [[1N3717]] or [[Russian tunnel diodes]]). <br />
# Replace transistors Q234 and Q244 with silicon transistors having Ft around 200 MHz and Beta around 100, such as 2N4248. <br />
# Replace resistor R236 (30.1 kΩ) with a 47 kΩ 1Watt resistor. <br />
# Add new 30K 1 watt resistors in series with R247 and R248, which are each 15 kΩ 2 watts. (Total resistance is now 45 kΩ each). <br />
# Because the Tunnel Diode must be biased below its trigger point, there is less adjustment margin with a 4.7mA Diode than with the original 10 mA Diode. This means that the values of R247 and R248 can be quite picky. Because of the variations between individual tunnel diodes, it may be necessary to use slightly smaller or larger resistances. <br />
<br />
Morris points out that the B Sweep Trigger circuit is identical to the A Sweep Trigger. This modification should therefore be equally applicable for that circuit.<br />
Dave Wise believes that for S/N 6740-up, you would modify R236, R233, and R246. The goal is same node voltages with <4.7mA through the diode instead of <10mA.<br />
<br />
[[Category:Repair issues]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=W&diff=71960W2022-01-21T19:26:22Z<p>Vintage dave: fill in specs</p>
<hr />
<div>{{Plugin Sidebar <br />
|manufacturer=Tektronix<br />
|series=500-series scopes<br />
|type=Type W <br />
|summary=8-23 MHz differential comparator <br />
|image=type w front.jpg <br />
|caption=Type W front view<br />
|introduced=1965<br />
|discontinued=1974<br />
|designers=John Horn <br />
|manuals=<br />
* [http://w140.com/mmm/tek-w.pdf Tektronix Type W Manual (37MB, PDF)]<br />
* [[Media:070-432.pdf|Tektronix Type W Manual (11MB, PDF)]]<br />
* [[Media:070-432_Schematic_SN3270up.pdf|Tektronix Type W Schematics Color for SN 3270 up (10MB, PDF)]]<br />
* [[Media:070-1109-00.pdf|Tektronix Type W SN 7000-up Manual (PDF, OCR)]]<br />
* [http://w140.com/tek_type_w_schematics.pdf Tektronix Type W Schematics Only (PDF)]<br />
* [[Media:Tek type w fcp jan 1969.pdf|Tektronix Type W Factory Calibration Procedure, January 1969 (PDF, needs OCR)]]<br />
* [[Media:Tek type w fcp no ocr.pdf|Tektronix Type W Factory Calibration Procedure, March 1969 (PDF, needs OCR)]]<br />
* [[Media:Tek type w cal outline.pdf|Tektronix Type W Calibration Outline (PDF, OCR)]]<br />
<!-- * [[Media:tek_type_w_schem_only.pdf|Tektronix Type W Schematics Only (PDF, OCR)]] --><br />
}}<br />
The '''Tektronix Type W''' is a differential comparator plug-in amplifier for [[500-series scopes]], designed by [[John Horn]].<br />
<br />
{{BeginSpecs}}<br />
{{Spec | Deflection | 1 mV/Div to 50 V/Div in 1–2–5-10-20-50 sequence and 1-10-100-1000 sequence }}<br />
{{Spec | Input impedance | 1 MΩ // 20 pF (either input) }}<br />
<br />
{{Spec | Bandwidth | 26 MHz with MILLIVOLTS/CM = 50 (23 MHz below S/N 7000); 8 MHz with MILLIVOLTS/CM = 1 }}<br />
{{Spec | Common Mode Dynamic Range | ±15V after INPUT ATTEN }}<br />
{{Spec | CMRR | DC Coupled: 20000:1 DC to 20kHz, 500:1 at 500kHz }}<br />
{{Spec | CMRR | AC Coupled: 1000:1 at 60 Hz }}<br />
{{Spec | Signal ranges | }}<br />
{| class="wikitable" border=1 style="margin-left: 8em;" |<br />
!Maximum Input Voltage (S/N 7000-up)<br />
|-<br />
| DC Coupled || 350 V<br />
|-<br />
| AC Coupled || 500 V<br />
|-<br />
!Maximum Input Voltage (S/N 101-6999)<br />
|-<br />
| INPUT ATTEN = 1 || 15 V<br />
|-<br />
| INPUT ATTEN = 10 || 150 V<br />
|-<br />
| INPUT ATTEN = 100 || ±350 V (DC Coupled); 500 V (AC Coupled)<br />
|-<br />
| INPUT ATTEN = 1000 || ±350 V (DC Coupled); 500 V (AC Coupled)<br />
|-<br />
|}<br />
Type W is faster (bandwidth 23 MHz to 8 MHz depending on gain) than its [[Z|Type Z]] predecessor, and it extends performance in terms of sensitivity, reaching 1 mV/div. <br />
It achieves 20,000 to 1 common-mode rejection at DC and low frequencies.<br />
<br />
{{EndSpecs}}<br />
<br />
==Operation==<br />
Type W has two signal inputs, "A" and "B", and a built in precision variable voltage supply, "V<sub>C</sub>", <br />
which is controlled by a ten-turn pot and can vary from either −1.1 V to +1.1 V or −11 V to +11 V. <br />
A mode switch selects between displaying A−V<sub>C</sub>, A−B, or V<sub>C</sub>−B. <br />
The "A−B" mode is particularly useful for displaying the current in a sense resistor, <br />
while the other modes provide "slideback" measurements of small variations superimposed on a large constant. <br />
An output of V<sub>C</sub> is provided on the front panel for precision measurements. <br />
<br />
Unlike the Type Z, Type W has two gain axes: a decade attenuator and a 1−2−5−10−20−50 selector, reminiscent of [[D|Type D]] from ten years before.<br />
<br />
Type W is the only letter-series plug-in with an "infinite resistance" input mode selectable at the front panel.<br />
(Types [[1A5]] and [[1A7]] have an internal jumper that can be cut.)<br />
<br />
Early production Type W in a [[556]] mainframe won't meet spec for overdrive recovery time, because an overdriven W passes enough common-mode to the mainframe vertical amp to saturate it. <br />
At S/N 3270, this was fixed, by adding another stage to attenuate CM. The new "output amp" circuit board clips onto the rear bulkhead; significant hand mods are required on the chassis.<br />
This was also offered as Modification kit 040-0447-00 to retrofit existing instruments.<br />
<br />
Type W was created with a pair of type [[8056]] [[Nuvistor|Nuvistors]] in the front end. In 1971 (S/N 7000), following the lead of Type [[1A7]], the Nuvistors were replaced by JFETs to reduce drift. <br />
Mod kit 040-0590-00 was offered for existing instruments.<br />
<br />
In the letter-series timeline of differential comparators, Type W, [[introduced in 1965]], follows [[Z|Type Z]] and precedes [[1A5|Type 1A5]].<br />
<br />
==Pictures==<br />
<gallery><br />
Type_w_front.jpg|Front view.<br />
Type_w_topleft.jpg|Top-left view. <br />
Type_w_bottom.jpg|Bottom view.<br />
Tek w block.png|Block Diagram<br />
Tek w differential comparator.png|Differential Comparator, initial version<br />
Tek w input attenuators.png|Input Attenuators<br />
Tek w switching diagram.png|Switching Diagram<br />
Tek type w a phase 1.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 2.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 3.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 4.jpg|A-phase (prototype) Type W<br />
Tek type w a phase 5.jpg|A-phase (prototype) Type W<br />
</gallery><br />
<br />
{{Parts|W}}<br />
<br />
[[Category:500 series plugins]]<br />
[[Category:Differential amplifiers]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Telequipment_Type_G&diff=70648Telequipment Type G2021-11-17T22:40:39Z<p>Vintage dave: Fix Type G picture</p>
<hr />
<div>{{Plugin Sidebar|<br />
manufacturer=Telequipment |series=Telequipment D43 S43 |type= Type G |<br />
summary=Telequipment Tube Oscilloscope Plugin Type G |<br />
image=Telequipment-G-Plugin.JPG |<br />
caption= |<br />
introduced=(?) |<br />
discontinued=(?) |<br />
designers= |<br />
manuals=<br />
* [[Media:Telequipment D43 Module G.pdf|Telequipment Type G Manual (PDF)]]<br />
}}<br />
<br />
The vertical amplifier type 'G' is a dual range, general purpose instrument with differential input facilities.<br />
<br />
{{MissingSpecs}}<br />
<br />
==Pictures==<br />
<gallery><br />
</gallery><br />
<br />
[[Category:Telequipment plugins]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Telequipment_plugins&diff=70647Telequipment plugins2021-11-17T22:38:34Z<p>Vintage dave: Add Type G picture</p>
<hr />
<div>'''[[Telequipment]]''' made the following plug-ins:<br />
<br />
<gallery widths="150" heights="180"><br />
Tq s1a 2.jpg | '''[[Telequipment S1]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br /> Single time base<br />
TQ S2A front2 cropped.jpg | '''[[Telequipment S2]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br /> Dual timebase<br />
Telequipment tv1.jpg | '''[[Telequipment TV1]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br /> Differential amplifier<br />
Telequipment type a 43a.jpg | '''[[Telequipment Type A]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment Type B plug-in.jpg | '''[[Telequipment Type B]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br />100 kHz differential amplifier<br />
Image needed.jpg | '''[[Telequipment Type C]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type CD]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type D]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment-G-Plugin.JPG | '''[[Telequipment Type G]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type H]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment HD2 2.jpg | '''[[Telequipment Type HD2]]'''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br />Vertical amplifier<br />
Image needed.jpg | '''[[Telequipment Type J]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment v1 manual photo.jpg| '''[[Telequipment V1]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />Single-channel amplifier<br />
TQ V3 Front View.jpg | '''[[Telequipment V3]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />Differential amplifier<br />
TQ V4 front cropped.jpg | '''[[Telequipment V4]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />50 MHz dual-channel amplifier<br />
TQ V5 Front View.jpg | '''[[Telequipment V5]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />Single-channel delay amplifier<br />
</gallery><br />
<br />
See also [[Telequipment scopes]].<br />
<br />
[[Category:Visual index pages]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=File:Telequipment-G-Plugin.JPG&diff=70646File:Telequipment-G-Plugin.JPG2021-11-17T22:37:11Z<p>Vintage dave: </p>
<hr />
<div></div>Vintage davehttps://w140.com/tekwiki/index.php?title=Telequipment_plugins&diff=70645Telequipment plugins2021-11-17T22:33:56Z<p>Vintage dave: Fix Type A picture</p>
<hr />
<div>'''[[Telequipment]]''' made the following plug-ins:<br />
<br />
<gallery widths="150" heights="180"><br />
Tq s1a 2.jpg | '''[[Telequipment S1]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br /> Single time base<br />
TQ S2A front2 cropped.jpg | '''[[Telequipment S2]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br /> Dual timebase<br />
Telequipment tv1.jpg | '''[[Telequipment TV1]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br /> Differential amplifier<br />
Telequipment type a 43a.jpg | '''[[Telequipment Type A]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment Type B plug-in.jpg | '''[[Telequipment Type B]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br />100 kHz differential amplifier<br />
Image needed.jpg | '''[[Telequipment Type C]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type CD]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type D]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type G]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Image needed.jpg | '''[[Telequipment Type H]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment HD2 2.jpg | '''[[Telequipment Type HD2]]'''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br />Vertical amplifier<br />
Image needed.jpg | '''[[Telequipment Type J]] '''<br />''[[Telequipment D43 S43|For D43, S43]]'' <br /><br />
Telequipment v1 manual photo.jpg| '''[[Telequipment V1]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />Single-channel amplifier<br />
TQ V3 Front View.jpg | '''[[Telequipment V3]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />Differential amplifier<br />
TQ V4 front cropped.jpg | '''[[Telequipment V4]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />50 MHz dual-channel amplifier<br />
TQ V5 Front View.jpg | '''[[Telequipment V5]] '''<br />''[[Telequipment D63 DM63 D75 D83|For D63, DM63, D75, D83]]'' <br />Single-channel delay amplifier<br />
</gallery><br />
<br />
See also [[Telequipment scopes]].<br />
<br />
[[Category:Visual index pages]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Telequipment_Type_A&diff=70644Telequipment Type A2021-11-17T22:31:46Z<p>Vintage dave: Fix main picture</p>
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<div>{{Plugin Sidebar<br />
|manufacturer=Telequipment <br />
|series=Telequipment D43 S43 <br />
|type=Type A <br />
|summary=Telequipment Tube Oscilloscope Plugin Type A <br />
|image=Telequipment type a 43a.jpg<br />
|caption=Telequipment Type A and 43A Plug-ins in an S43<br />
|introduced=(?) <br />
|discontinued=(?) <br />
|designers= <br />
|manuals=<br />
* [[Media:Telequipment type a schematics.pdf|Telequipment Type A Plug-in Schematics (PDF)]]<br />
}}<br />
The '''Telequipment Type A plug-in''', also known as the 43A, is a 15 MHz vertical plug-in for the [[Telequipment D43|D43]] and [[Telequipment S43|S43]]. <br />
The Type A is four-stage fully differential DC-coupled all-tube amplifier. <br />
The input impedance is 1 MΩ in parallel with 40 pF. <br />
The Type A drives the CRT deflection plates directly via [[ECC88]] cathode-followers. <br />
<br />
{{MissingSpecs}}<br />
<br />
==Pictures==<br />
<gallery><br />
Telequipment type a 43a.jpg|Telequipment Type A and 43A Plug-ins in an S43<br />
Telequipment s43 with 43a.jpg|Telequipment S43 with Type A and 43A Plug-ins<br />
</gallery><br />
<br />
{{Parts|Telequipment Type A}}<br />
<br />
[[Category:Telequipment plugins]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=T932&diff=70643T9322021-11-17T22:00:34Z<p>Vintage dave: Fixed BAMA link, just a typo in the path or they changed it</p>
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<div>{{Oscilloscope Sidebar |manufacturer=Tektronix |designers= |series=T900-series scopes |<br />
model= T932 |<br />
summary=35 MHz dual channel analog scope |<br />
image=Tek 932a 3.jpg |<br />
caption=Tektronix T932A |<br />
introduced=1976 |<br />
discontinued=1981 |<br />
manuals=<br />
* [[https://bama.edebris.com/download/tek/t932/Tek%20T932A-935A.pdf Tektronix T932A/T935A Manual]]<br />
* [[Media:070-2492-00.pdf|Tektronix T932A/T935A Manual]]<br />
}}<br />
The '''Tektronix T932''' is a 35 MHz dual channel, single-timebase analog scope <br />
from the [[T900-series scopes | T900 series]]. The [[T935]] is the same with a dual timebase.<br />
There also a 932A, which has additional features like differential input (A-B), X/Y mode in full sensitivity for both channels, DC trigger coupling, composite trigger, and user-selectable CHOP/ALT mode. Non A series select ALT/CHOP mode automatically based on sweep rate.<br />
<br />
* [[Media:932A-935A_1978-Catalog.pdf |932A Description from 1978 catalog (PDF)]]<br />
<br />
{{BeginSpecs}}<br />
{{Spec | Bandwidth | 35 MHz }}<br />
{{Spec | Deflection | 2 mV/Div to 10 V/Div, 1–2–5; 2.5× variable }}<br />
{{Spec | Sweep | 100 ns/Div to 500 ms/Div, 1–2–5; variable magnifier up to ×10 (i.e. down to 10 ns/Div) }}<br />
{{Spec | X-Y Mode | X input 1 MΩ // 30 pF, 0.1 or 1 V/Div, 2 MHz }}<br />
{{Spec | CRT | [[154-0729-00]], 8 × 10 cm², P31 [[phosphor]], 12.4 kV acceleration }}<br />
{{Spec | Power | 90-110 V, 108-132 V, 198-242 V, 216-250 V, 50-60 Hz, <35 W }}<br />
{{Spec | Dimensions | 18 × 24.4 × 47.5 cm³ (W/H/L) }}<br />
{{Spec | Weight | 6.8 kg (15 lbs) }}<br />
{{Spec | Features |<br />
* TV Sync<br />
* Z input (max. ±30 V into 10 kΩ, 5 MHz)<br />
* Calibrator (1 kHz, 0.5 V)<br />
}}<br />
{{EndSpecs}}<br />
<br />
==Pictures==<br />
<br />
<gallery><br />
T932.jpg | T932<br />
Tek 932a 1.jpg | T932A<br />
Tek 932a 2.jpg | T932A<br />
Tek 932a 3.jpg | T932A<br />
Tek 932a 4.jpg | T932A<br />
Tek 932a trace.jpg|T932A trace<br />
</gallery><br />
===Internal===<br />
<gallery><br />
T932A_Top_Internal1.jpg | T932A top<br />
T932A_Bottom_Internal1.jpg | T932A bottom (position knobs removed)<br />
T932A_Left_Internal1.jpg | T932A left<br />
T932A_Right_Internal1.jpg | T932A right<br />
</gallery><br />
<br />
[[Category:T900 series scopes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Talk:453&diff=70642Talk:4532021-11-17T21:50:46Z<p>Vintage dave: </p>
<hr />
<div>Hi Dave, sorry for nitpicking, it's not 6 x 10 cm, you're missing a dimension there - it's either 6 cm x 10 cm, or 6 x 10 cm² which is a perfectly valid way to write this (I realize this format is more common in Europe than in the US).<br />
<br />
Thanks, [[User:Peter|Peter]] ([[User talk:Peter|talk]]) 05:14, 16 November 2021 (PST)<br />
<br />
Perhaps I'm using an American idiom. To me "6 x 10 cm" is an abbreviated way of saying "6 cm x 10 cm", while "6 x 10 cm²" sounds like "6 cm² x 10 cm²". I won't fret about it.<br />
<br />
Regards, [[User:Vintage Dave|Dave]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Talk:Miniature_relays&diff=70509Talk:Miniature relays2021-11-15T23:24:39Z<p>Vintage dave: Created page with "IIRC, the failure mechanism is that heating makes the coil outgas, and with no air vent, it condenses on the contacts when the relay cools off. Sometimes you can restore oper..."</p>
<hr />
<div>IIRC, the failure mechanism is that heating makes the coil outgas, and with no air vent, it condenses on the contacts when the relay cools off. Sometimes you can restore operation by exercising the relay with a square wave. Caution is advised since too much hammering will wear away the precious-metal plating on the contacts, leading to corrosion.<br />
<br />
The case is also Delrin. [[Bruce Keefer]] told me it "burns with a beautiful blue flame", which the safety folks just loved.</div>Vintage davehttps://w140.com/tekwiki/index.php?title=Talk:535&diff=70508Talk:5352021-11-15T23:03:41Z<p>Vintage dave: Created page with "Serial number 101-8627 had an input amplifier, forward-terminated delay line, and an output amplifier driving the CRT deflection plates. At S/N 8628 this was replaced with on..."</p>
<hr />
<div>Serial number 101-8627 had an input amplifier, forward-terminated delay line, and an output amplifier driving the CRT deflection plates. At S/N 8628 this was replaced with one amplifier, reverse-terminated delay line, and CRT plates. In conversation, [[John Kobbe]] told me he had realized that the termination could absorb the reflection bump caused by the mis-terminated CRT plates. This innovation was applied to Type [[545]] development and no instruments were made with the old two-piece architecture.</div>Vintage davehttps://w140.com/tekwiki/index.php?title=7189A&diff=705077189A2021-11-15T22:45:36Z<p>Vintage dave: typo</p>
<hr />
<div>{{Vacuum Tube<br />
|Type=Pentode<br />
|Number=7189A<br />
|EuroNumber=<br />
|RussianNumber=<br />
|Part_nos=154-0503-00<br />
|Description=power pentode<br />
|Used_in=106;<br />
|Designers=<br />
}} with a {{B9A base}}. <br />
<br />
The 7189A is the higher voltage and power version of the [[6BQ5]]/EL84 and the [[7189]] vacuum tubes. It can handle 400 volts on the screen and 440 volts on the plate. Its maximum screen dissipation is 2.2 W, and the maximum plate dissipation is 13.2 W.<br />
<br />
Note that the pinout of the 7189A is different from the [[7189]] - the screen grid is additionally connected to pin 6, and the control grid additionally to pin 1 (for better heat dissipation).<br />
You must rewire the socket to use a [[7189]] in place of a 7189A in the Tektronix [[106]].<br />
<br />
GE was the only US maker of the 7189A.<br />
<br />
==Used in==<br />
* Four 7189As are used in the output stage of the [[106]]<br />
<br />
==Data==<br />
<br />
* [[Media:7189A.pdf | 7189A GE data sheet]]<br />
* [[tube:7189a|7189A @ radiomuseum.org]] / [https://www.radiomuseum.org/forum/7189a_7189a2.html]<br />
<br />
{{MissingPics}}<br />
<br />
[[Category:Pentodes]]</div>Vintage davehttps://w140.com/tekwiki/index.php?title=453/Repairs&diff=70506453/Repairs2021-11-15T22:31:54Z<p>Vintage dave: HV Transformer Rewind</p>
<hr />
<div>My 453 (serial number 000977) developed HV transformer loss like the well-known problem in Type [[547]]. In 2015 I rewound the transformer using a low-tech procedure documented in the TekScopes group at groups.io, see Topic and Photo Album "453 HV Transformer Rewind". The scope is still happy in 2021.</div>Vintage dave