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(Power Supply Description) |
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{{Oscilloscope Sidebar | | {{Oscilloscope Sidebar | ||
|manufacturer=Tektronix | |||
summary=30 MHz storage | |series=500-series scopes | ||
image=Tek-549 and d.jpg | | |model=549 | ||
caption=Tektronix 549 front | | |summary=30 MHz storage oscilloscope | ||
introduced= | |image=Tek-549 and d.jpg | ||
discontinued=1974 | | |caption=Tektronix 549 front | ||
manuals= | |introduced=1965 | ||
* [ | |discontinued=1974 | ||
* [ | |designers=Mel Holznagel;Bob Shand; | ||
* [ | |manuals= | ||
* [ | * [[Media:070-0508-00.pdf | Tektronix 549 Manual]] (OCR) | ||
* [https://w140.com/mmm/tek-549.pdf Tektronix 549 Manual] | |||
* [https://bama.edebris.com/manuals/tek/549 Tektronix 549 Manual] @ BAMA | |||
====Maintenance Notes==== | |||
* [[Media:tek_549_crt_socket_leak.pdf|Maintenance Note: 549 CRT Socket Leakage]] (OCR) | |||
* [[Media:tek_549_note_ringing_1a1.pdf|Maintenance Note: 549 Ringing with 1A1]] (OCR) | |||
====Data Sheets and Catalogs==== | |||
* [[Media:tek_549_catalog.pdf|Tektronix 549 in 1968 Catalog]] (OCR) | |||
* [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German]] (OCR) | |||
* [[Media:tek_549_Remote_Control_DS.pdf|Tektronix 549 Remote Control Datasheet]] (OCR) | |||
}} | }} | ||
The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] | The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] in the 500 series (except for the [[537]] that never left prototype stage). | ||
or 1-series vertical plug-in]]. | It takes a [[Letter-series_and_1-series_plug-ins|letter-series or 1-series vertical plug-in]]. | ||
The 549 was [[introduced in 1965]] and discontinued after 1973. | |||
The 549 vertical output stage was designed by [[Mel Holznagel]]. [[Bob Shand]] did the mechanical design. | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Bandwidth | DC to 30 MHz ( | {{Spec | Bandwidth | DC to 30 MHz (−3 dB) with fast plug-ins ([[1A1]], [[1A2]], [[1A4]], [[1A5]]) }} | ||
{{Spec | Rise time | 12 ns }} | {{Spec | Rise time | 12 ns }} | ||
{{Spec | | {{Spec | Writing speed | 5 cm/μs }} | ||
{{Spec | Line | {{Spec | Line voltage | 104/115/127 or 208/230/254 V<sub>AC</sub> ±10%, selected via primary voltage selector (inside cabinet) and voltage range selector (on rear panel), 50 to 60 Hz }} | ||
{{Spec | Thermal | {{Spec | Thermal protection | 65°C (150°F) Automatic resetting [[thermal cutoff]] }} | ||
{{Spec | Power | {{Spec | Power consumption | 650 W, 750 VA }} | ||
{{Spec | Size | {{Spec | Size | 43.2 cm × 32.9 cm × 60.7 cm (W/L/H, 13" × 24" × 17") }} | ||
{{Spec | Weight | {{Spec | Weight | 31 kg (68 lb) }} | ||
{{Spec | Cooling | AC Fan }} | {{Spec | Cooling | AC Fan }} | ||
{{Spec | | {{Spec | Accessories | [[012-0102-00|012-0102-00 remote control cable/switch]] }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
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to have linear phase response over this same frequency range. | to have linear phase response over this same frequency range. | ||
In the 549, this buffer is implemented | In the 549, this buffer is implemented with a [[6DJ8]] cathode follower at the plug-in interface | ||
cathode follower | driving an NPN BJT differential amplifier at the bottom of a cascode with a [[7119]] tube on top. | ||
The output of the cascode (the plate of the 7119) drives the [[delay line]]. | The output of the cascode (the plate of the 7119) drives the [[delay line]]. | ||
Since the entire signal path is differential, | Since the entire signal path is differential, the common-mode voltage does not have to be zero, | ||
the common-mode voltage does not have to be zero, and it is not | and it is not – the differential signal in the delay line rides on 167 volts of DC. | ||
the differential signal in the delay line rides on 167 volts of DC | |||
After the delay line, the signal enters another cascoded differential amplifier with NPN BJTs | |||
on the bottom and a pair of 10-watt [[8608]] power pentodes on the top whose plates drive the | |||
CRT's vertical deflection plates of the CRT through inductive matching/peaking networks. | |||
===Non-Distributed Amplifier=== | ===Non-Distributed Amplifier=== | ||
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===Storage=== | ===Storage=== | ||
The 549 uses the [[T5490]] CRT. | The 549 uses the [[T5490]] CRT which has two storage targets, upper and lower, | ||
whose storage mode and erase signals can be controlled independently. | |||
The [[012-0102-00|012-0102-00 remote control cable/switch]] (also used for [[564B]]) can be used to remotely erase the screen and reset the single sweep. | |||
It connects to an [[Amphenol 165 series connectors|Amphenol 165-16 socket]] at the rear top of the scope (see [[549 remote control connector]] for pin-out). | |||
===Power Supply=== | |||
The 549's power supply provides regulated outputs of −12.4 V, −150 V, +100 V, +225 V, +300 V, +350 V, and +500 V as well as a +475 V unregulated output. | |||
=== | |||
549 | |||
Line input is connected to main transformer primary via two switches, one to select | Line input is connected to main transformer primary via two switches, one inside the chassis to select the 110 V or 230 V range, and another on the rear of the chassis to select Low/Medium/High voltage in either range. | ||
Multiple secondary windings feeds diodes for rectification for different voltages. Both center-tap and bridge configuration is used. | Multiple secondary windings feeds diodes for rectification for different voltages. Both center-tap and bridge configuration is used. Transistors and/or tubes are used for regulation. | ||
Transistors and/or | |||
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. Only the −150 V voltage is trimmed, its reference is a [[5651]] VR tube. A [[12AX7]] is used as the comparator, three [[12B4]] in parallel are used as series pass tubes. A [[6AU6]] is used as an error amplifier. | |||
5651 VR | |||
Most other stages replicate the same design, except slight changes in | Most other stages replicate the same design, except slight changes in tubes used − the +350 V, +225 V and +100 V regulators employ a [[6080]] as the pass element. | ||
The | The −12.4 V regulator is transistor-based. | ||
The 549 power supply uses a [[delay relay|6N030 delay relay (P/N 148-0021-00)]] to control a relay that switches supply voltages on only after the tubes are warmed up. On power up, only heater voltage is applied to the tubes. After a delay of up to 60 seconds, the thermal delay relay activates the main relay (driven from unregulated +170 V). This also cuts out the delay relay, which can cool down and will be ready to delay again even after a quick interrupt in power input. | |||
The | The 549 has a 65°C (150°F) [[thermal cutoff]]. | ||
The 549 uses a [[120-0423-00]] HV transformer driven by a [[6GF5]] tube from +470 V. | |||
===HV Transformer Problem and Replacement=== | |||
The HV transformer (part #120-0423-00) uses epoxy impregnation like models 544,545B,546,547,556 and as such suffers the same issue of increasing losses with age unlike the earlier bee's wax transformers. This issue will eventually lead to failure of the HV oscillator circuit resulting in loss of display intensity, blooming and finally vanishing trace. One solution is to use a donor HV transformer out of a 564 storage scope. This was successfully implemented by Morris Odell and Deon Vandenberg however invented by another. A photo is provided below showing the new transformer installed with terminals arbitrarily labelled to help others perform the same task. Looking at the photo the top connections are obvious. The left middle connection goes to the right strip pin 9 (labelled as 9) The bottom section has two connections, one on the left towards the neons(labelled A) this goes to the anode of the driver tube V800 pin 7. The other obscured wire is the bottom left which goes to the 4th pin on the left strip (labelled as 4). Resistor R807 is to be changed from 39k to 47k. Resistor R2 is to be added between the junction of D836 and C842 and R837. (See schematic.) When this is done adjust the HT at the test point to -3700V (R855) and adjust R815 to make the grid voltage -3790V (located at test point labelled TP). To see the new transformer in action click on the bottom youtube link. | |||
==Links== | ==Links== | ||
* [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration] | * [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration] / [https://www.youtube.com/watch?v=8rWH-uuf60U Video] | ||
* [http://www.radiomuseum.org/forum/tektronix_the_storage_story.html Tektronix, the Storage Story] (1966) @ radiomuseum.org | * [http://www.radiomuseum.org/forum/tektronix_the_storage_story.html Tektronix, the Storage Story] (1966) @ radiomuseum.org | ||
* A [https://www.youtube.com/watch?v=1SRtm7eva0A 549 @ YouTube] | * A [https://www.youtube.com/watch?v=1SRtm7eva0A 549 @ YouTube] | ||
* [https://www.youtube.com/watch?v=D6szONQe1go&t=6s Deon's 549 with 564 HT Transformer] | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek 549 | Tek-549 and d.jpg | 549 front, earlier round bezel | ||
Tek 549 | Tek 549 mt1.jpg | 549 front, later rectangular bezel | ||
Tek-549-front.jpg | |||
Tek 549 front | Tek 549 trace2.jpg | | ||
Tek_549-Front.jpeg | | |||
Tek_549-Stroage-Ctrl.jpeg | 549 Storage controls | |||
Tek 549 trace2..jpg | | |||
Tek 549 trace.jpg | | |||
Tek 549 front fl.jpg | | |||
549_front.jpg | Front of a 549 | |||
Wellenkino 549-1.jpg | | |||
Tek 549 front fl.jpg | | |||
Tek 549 1a4 1.jpg | | |||
Tek 549 1a4 2.jpg | | |||
Tek_549-Rear.jpeg | 549 Rear | |||
Tek_549-Line-Range.jpeg | Line voltage selector | |||
Tek 549 front fl.jpg | Tek 549 1a4 3.jpg | | ||
Tek 549 1a4 1.jpg | Tek 549 1a4 4.jpg | | ||
Tek 549 1a4 2.jpg | 549_Delayed_Trace.jpg | B INTEN BY A Trig in 549 | ||
Tek 549 1a4 3.jpg | 549_Dual_Trace.jpg | Dual trace display in 549 | ||
Tek 549 1a4 4.jpg | Tek 549-1 knob layout.jpg | 549 knob layout | ||
549_Delayed_Trace.jpg|B INTEN BY A Trig in | Tek 549 - Electronics 1965-08-23.jpg | 549 ad in Electronics 1965-08-23 | ||
549_Dual_Trace.jpg|Dual | |||
</gallery> | </gallery> | ||
===Internal=== | |||
<gallery> | |||
Tek_549-LHS.jpeg | LHS | |||
Tek_549-RHS.jpeg | RHS | |||
Tek_549-RHS-Timebase.jpeg | RHS Timebase Ch: Door Open | |||
Tek_549-Top.jpeg | Top | |||
Tek_549-Under.jpeg | Underside | |||
Tek_549-V-Amp.jpeg | 8608 vertical output tubes | |||
549_vert_amp.jpg | Vertical amp | |||
549_Vertical_OP.jpg | 8608 vertical output tubes | |||
Tek 549 vertamp on.jpg | 8608 vertical output tubes | |||
549 v out.jpg | |||
549_top.jpg | Top view | |||
549_storage_board.jpg | Storage board | |||
549_inside_door.jpg | Power supply behind door | |||
Wellenkino_549-8.jpg | Right side internal | |||
Wellenkino 549-7.jpg | | |||
Wellenkino 549-6.jpg | | |||
Tek_549-Prim-Sel-Sw.jpeg | Primary voltage range selector | |||
549_Tubes_ON1.jpg | LV power supply tubes | |||
549_Tubes_ON.jpg | LV power supply tubes | |||
Tek_549_Storage_Board.jpg | Storage board Rev "PC" (recapped) | |||
Tek_549-storage_board_Rev_PE.JPG | Storage board Rev "PE" | |||
</gallery> | |||
===HT Transformer modification=== | |||
<gallery> | |||
564 HV Transformer installed in the 549.jpeg | 564 HV transformer installed in the 549 | |||
Schematic of HT transformer modifications.jpeg | Schematic showing other changes required | |||
</gallery> | |||
==Components== | |||
{{Parts|549}} | |||
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[[Category:Introduced in 1966]] | [[Category:Introduced in 1966]] | ||
[[Category:Analog storage scopes]] | [[Category:Analog storage scopes]] | ||