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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar  
title=Tektronix 547 |
|manufacturer=Tektronix
summary=50 MHz scope |
|model=547  
image=Tek 547 trace.jpg |
|summary=50 MHz oscilloscope
caption=Tektronix 547 with [[1A2]] plugin |
|image=Tek 547 D-Alt-Trace.jpeg
introduced=1964 |
|caption=Tektronix 547 with [[1A1]] plugin, in ALT Delayed Trigger 
discontinued=1975 |
|introduced=1964  
manuals=
|discontinued=1975  
* [http://bama.edebris.com/download/tek/547/547.djvu Tektronix 547 Manual (DjVu)]
|designers=Bob Rullman;Keith Taylor;John Gates;Gene Kauffman;George Smith
* [http://w140.com/tek_547.pdf Tektronix 547 Manual (PDF)]
|series=500-series scopes
|manuals=
* [[Media:070-0398-00.pdf|Tektronix 547/RM547 Manual]] <small>070-0398-00, plus "547 Notes"</small> (OCR)
* [[Media:Tek_547_544_546_tech_instr_and_training.pdf|Tektronix 544/546/547 Technical Instruction and Training]] (OCR)
* [[Media:Tek 547 fcp.pdf|Tektronix 547 Factory Calibration Procedure]]
* [[Media:Tek 547 cal procedure.pdf]]
<small>
'''Alternate versions'''
* [https://bama.edebris.com/download/tek/547/547.djvu Tektronix 547 Manual] (DjVu @ BAMA)
* [[Media:070-0398-00 (2).pdf|Tektronix 547 Manual 070-0398-00]]
</small>
<small>
'''Modifications'''
* [[Media:Tek 547 mods.pdf|Tektronix 547 Modifications]]
* [[Media:050-0479-01.pdf|Disconnect Diode 547/R547 Serials 100-12479]] Tek Part [[050-0479-01]]
</small>
}}
}}
The '''Tektronix 547''' is a 50 MHz scope that takes [[letter-series and 1-series plug-ins]].   
The '''Tektronix 547''' is a 50 MHz scope that takes [[letter-series and 1-series plug-ins]].   
It has two identical timebases and,  
 
when used with the [[1A1]], [[1A2]], or [[1A4]],  
It has two identical timebases and, when used with the [[1A1]], [[1A2]], or [[1A4]],  
has the ability to display one input with one time scale and another input with a different time scale.   
has the ability to display one input with one time scale and another input with a different time scale.   
The effect is similar to a [[dual-beam scopes|dual-beam scope]]  
The effect is similar to a [[dual-beam scopes|dual-beam scope]]  
Line 20: Line 35:
There is also a rackmount version, the RM547 or R547.   
There is also a rackmount version, the RM547 or R547.   


The project lead for the development of the Tektronix [[544]], [[546]], and 547 was [[Bob Rullman]].
The program manager for the development of the Tektronix [[544]], [[546]], and 547 was [[Bob Rullman]].
The 547 vertical amplifier was designed by [[Keith Taylor]].
Other people involved with the design were [[John Gates]], [[Gene Kauffman]], and [[George Smith]].
 
{{BeginSpecs}}
{{Spec | Bandwidth                | DC to 50 MHz (−3 dB) with fast plug-ins ([[1A1]], [[1A2]], [[1A4]], [[1A5]]) }}
{{Spec | Rise time                | 7 ns with [[1A1]] }}
{{Spec | Sweep Rates              | 100 ns/div to 5 s/div}}
{{Spec | External Horizontal Input | 100 mV/cm to 10 V/cm, DC to 400 kHz}}
{{Spec | CRT                      | [[T5470]] (154-0478-00 standard), 10 kV acceleration, 6x10 cm viewing area }}
{{Spec | Calibrator                | ~1 kHz, 200 μV<sub>p-p</sub> to 100 V<sub>p-p</sub> }}
{{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 }}
{{EndSpecs}}
 
==Links==
* [https://lazyelectrons.wordpress.com/2018/07/06/tektronix-547-oscilloscope-restoration 547 Restoration with video]
* 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]
* "MightyOhm" blog: [http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ Jim Williams workbench]
* [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
* 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]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/547.htm Tek 547 page @ amplifier.cd]
* [http://www.ebay.com/gds/The-Tektronix-547-Oscilloscope-Magic-in-the-Box-/10000000000725321/g.html The Tektronix 547 Oscilloscope - Magic in the Box]
* [http://www.thevalvepage.com/testeq/tek/547/547.htm J.Evans's 547 page]
{{Documents|Link=547}}
{{PatentLinks|547}}


==Internals==
==Internals==
===Triggering===
===Triggering===
Triggering is done with [[tunnel diodes]].
The 'A' and 'B' triggers are based on a 10 mA [[tunnel diodes|tunnel diode]].
The 'A' trigger is based on a 10 mA tunnel diode.
Up to serial number 11889, it uses a [[TD253]].
Up to serial number 11889, it uses a [[TD253]].
From 11890 onward, it uses a [[152-0140-01]].
From 11890 onward, it uses a [[152-0140-01]].


===CRT===
The 547 uses the Tektronix [[154-0478-00]] CRT.
===HV Transformer===
===HV Transformer===
A common problem with 547s is the [[HV transformers|HV transformer]].  
A common problem with 547s is the [[HV transformers|HV transformer]].  
Rather than potting the HV transformer in wax, as was done up to that point,  
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.
the 547's HV transformer was potted in epoxy.
Unfortunately, this epoxy turned out to absorb moisture over time, particularly when used in humid climates.
Unfortunately, this epoxy turned out to absorb moisture over time,  
particularly when used in humid climates.
The moisture causes increased losses in the transformer.  
The moisture causes increased losses in the transformer.  
Excessive losses require the regulator to drive the [[6AU5]] input oscillator tube (V800) harder.   
Excessive losses require the regulator to drive the [[6AU5]] input oscillator tube (V800) harder.   
Eventually, the drive circuit cannot supply enough power to keep the supply in regulation.
Eventually, the drive circuit cannot supply enough power to keep the supply in regulation.
The usual solution is to scavenge a replacement transformer from another scope.
The usual solution is to scavenge a replacement transformer from another scope.
As a labor of love, hobbyists have been known to rebuild the HV transformers.
As a labor of love, hobbyists have been known to rebuild the HV transformers.
This is discussed from time to time on the Yahoo TekScopes forum.
This is discussed from time to time on the groups.io (formerly Yahoo) TekScopes forum.
 
Bernie Schroder has found that the HV transformer degeneration can be slowed considerably by keeping the HV module cool and dry.
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.
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.
 
After changing to semiconductor diodes, it will be seen that grid pin 7 of V814 will be about 0 volts (fully on,
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).
 
One way to remedy this is to replace the anode resistor coming off pin 6 of V814 (R803) from 56 kΩ to 82 kΩ.
Doing so changes the grid voltage on pin 7 of V814 to a comfortable −0.8 V at switch-on.
 
Again, this becomes more negative as the losses inside the transformer increase, but not by much if the transformer is healthy.
 
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.


===Vertical Amplifier===
===Vertical Amplifier===
The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in
The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in connector to the CRT vertical deflection plates.  
connector to the CRT vertical deflection plates. There is one tube in the vertical signal path,
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.
a [[12AT7]] acting as a unity-gain buffer between the plug-in connector and the vertical amplifier.
 
====Spoiler Switch====
The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's vertical signal path
when certain relatively modern plug-ins are used, such as the [[1A1]], [[1A2]], [[1A4]], and [[1A5]].
 
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.
(Spectrum analyzer plug-in Types [[1L30]] and [[1L40]] have the hole too but for no reason since their vertical output is low frequency.)
 
* [[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]]
* [[Media:Spoiler switch rationale from Tek 547 notes.pdf|Spoiler switch explanation excerpted from Tek 547 Notes]]


====Delay Line====
There is a 170 nanosecond [[delay line]] between the first and second gain stages.
There is a 170 nanosecond [[delay line]] between the first and second gain stages.


==Links==
===Power Supply ===
 
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.
 
Multiple secondary windings feed diodes for rectification for different voltages, using both center-tap and bridge configurations.
The regulator section uses no transistors, only tubes.  There are multiple 6.3 V secondary outputs for heaters, some elevated to different voltage levels
based on the section/tube that is supplied, in order to keep the heater-to-cathode voltage level within limits.
 
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 [[OG3]] VR tube.
A [[12AX7]] is used as the comparator and two [[6CW5]] in parallel are used as series pass tubes.
A [[6AU6]] is used as an error amplifier.
Most other power supply sections in the 547 replicate the same basic design, except slight changes in tubes used:
The +225 V and +100 V regulators employ a [[6080]] as the pass element, and +350 uses a [[6CW5]].
 
The plate voltage delay circuit is similar to that found in many may other Tek scopes of the same era. 
Heater voltage is applied to all tubes immediately when the power switch is turned on.
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.


* 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]
==Common Problems==
* "MightyOhm" blog: [http://mightyohm.com/blog/2012/02/an-analog-life-my-pilgrimage-to-the-workbench-of-analog-guru-jim-williams/ Jim Williams workbench]
* See [[547/Repairs]]
* [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
* 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]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/547.htm Tek 547 page @ amplifier.cd]
* [http://www.ebay.com/gds/The-Tektronix-547-Oscilloscope-Magic-in-the-Box-/10000000000725321/g.html The Tektronix 547 Oscilloscope - Magic in the Box]
* [http://www.thevalvepage.com/testeq/tek/547/547.htm J.Evans's 547 page]


==Pictures==
==Pictures==
===547===
<gallery>
<gallery>
Tek 547 1a2 new.jpg
Tek 547 trace.jpg | 547 with [[1A2]]
Tek 547 1a2 new.jpg|547 with [[1A2]]
Tek 547.jpg|Front view
Tek 547.jpg|Front view
547_01.JPG|Top
Tek 547 eng.jpg|547 serial "ENG B 23"
547_02.JPG|Right
Tek 547 eng2.jpg|547 serial "ENG B 23"
547_03.JPG|Left
Tek-547 vert amp2.png|Vertical amplifier
Tek-547-trigger a.png|Trigger A
Tek rm547.jpg|RM547
Tek 547 ampex front.jpg
Tek 547 ampex front.jpg
Tek 547 ampex right internal.jpg
Tek_547_Delayed_Trigger1.JPG | Tek 547 Delayed Trigger & ALT Sweep
Tek 547 ampex left internal.jpg
Tek_547_Delayed_Trigger2.jpg | Tek 547 Delayed Trigger & ALT Sweep
Tek 547 trace two sine.jpg|547 trace
Tek 547 1a1 front.jpg|547 with [[1A1]]
Tek_547_4-Trace.jpg | 547 with 1A2 in ALT Sweep Mode
Tek_547_Delayed_Trig.jpg | 547 Delayed Trace
Tek 547 ampex right external.jpg
Tek 547 ampex right external.jpg
Tek 547 ampex rear.jpg
Tek 547 ampex rear.jpg
Grey face 547.jpg|Gray 547
Grey face 547.jpg|Gray 547
Tek rm547 trace.jpg
Tek 547 rear close.jpg
Tek 547 rear close.jpg
Tek 547 eng.jpg|547 serial "ENG B 23"
Tek 547 eng2.jpg|547 serial "ENG B 23"
Tek 547 rear connections.jpg|rear connections
Tek 547 rear connections.jpg|rear connections
Tek_547_Vert_Amp.jpg | Tek 547 Vertical Amplifier  
</gallery>
===547 Internals===
<gallery>
Tek_547-Top.jpeg | Internals - Top
Tek_547-RHS-TBOpen.jpeg | Internals - RHS
Tek_547-RHS.jpeg | Internals - Time Base - RHS
Tek_547-Internal-LHS.jpeg | Internals - LHS
Tek_547-Internal-Bottom.jpeg | Internals - Bottom
Tek_547_HVSection-NoCover.jpg | Tek 547 HV Section and [[5642]]HV Rectifier Tube (Cover removed)
Tek_547_HV_Diodes.jpg | Solid State HV Diode Mod
Tek_547-TunnelDiodes-Trigger.jpg | Tunnel Diodes TD253 and TD3A in a Tek 547 Trigger/ Sweep Section
Tunnel_DIode_1D2_2.2mA.jpg | 2.2 mA Tunnel Diode in 547 Delay Pickoff
Tek_547_Vert_Amp.jpg | Tek 547 Vertical Amplifier. The output transistors are mounted on [[beryllium oxide]] discs.
547_01.JPG|Top
547_02.JPG|Right
547_03.JPG|Left
Tek_547_CRT1.jpg | Tek 547 CRT
Tek_547_CRT1.jpg | Tek 547 CRT
Tek_547_CRT2.jpg | Tek 547 CRT Side View
Tek_547_CRT2.jpg | Tek 547 CRT Side View
Tek_547_CRT_Def_Plates1.jpg | Tek 547 CRT Deflection Plates & Assembly
Tek_547_CRT_Def_Plates1.jpg | Tek 547 CRT Deflection Plates & Assembly
Tek_547_CRT_Def_Plates2.jpg | Tek 547 CRT Electron Gun Assembly
Tek_547_CRT_Def_Plates2.jpg | Tek 547 CRT Electron Gun Assembly
Tek_547_UnderChassis-No-Transformer.jpg | Tek 547 Underside of Chassis. Main Transformer is Not Present.
Tek_547_Chassis_Without_CRT.jpg | Tek 547 Chassis Without CRT and Plug in
Tek_547_Chassis_Without_CRT.jpg | Tek 547 Chassis Without CRT and Plug in
Tek_547_Top.jpg | Tek 547 Top
Tek_547_Screen.jpg | Tek 547 Screen Scale 
Tek_547_HVSection-NoCover.jpg | Tek 547 HV Section (Cover removed)
Tek_547_Power-Transformer3.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer3.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer2.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer2.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer1.jpg  | Tek 547 Main Transformer
Tek_547_Power-Transformer1.jpg  | Tek 547 Main Transformer
Tek_547_Tubes.jpg | Tek 547 Inside view with Power ON
Tek_547_Tubes.jpg | Tek 547 Inside view with Power ON
Tek_547_Transformer.jpg | 547 LV Transformer Connections
Tek_547_Inside_Tubes.jpg | Inside a Tek 547
Tek 547 ampex right internal.jpg
Tek 547 ampex left internal.jpg
</gallery>


=== RM 547===
<gallery>
Tek rm547.jpg|RM547
Tek rm547 trace.jpg
Tektronix rm547.jpg
</gallery>
</gallery>
=== Schematics ===
<gallery>
Tek-547-trigger a.png|Trigger A
Tek-547 vert amp2.png|Vertical amplifier
</gallery>
==Components==
{{Parts|547}}


[[Category:500 series scopes]]
[[Category:500 series scopes]]

Latest revision as of 15:36, 18 August 2024

The Tektronix 547 is a 50 MHz scope that takes letter-series and 1-series plug-ins.

Tektronix 547
50 MHz oscilloscope
Tektronix 547 with 1A1 plugin, in ALT Delayed Trigger

Produced from 1964 to 1975

Manuals

It has two identical timebases and, when used with the 1A1, 1A2, or 1A4, has the ability to display one input with one time scale and another input with a different time scale. The effect is similar to a dual-beam scope assuming that the input signals are repetitive. This "Sweep Switching" feature differentiates the 547 from the 546.

There is also a rackmount version, the RM547 or R547.

The program manager for the development of the Tektronix 544, 546, and 547 was Bob Rullman. The 547 vertical amplifier was designed by Keith Taylor. Other people involved with the design were John Gates, Gene Kauffman, and George Smith.

Key Specifications

Bandwidth DC to 50 MHz (−3 dB) with fast plug-ins (1A1, 1A2, 1A4, 1A5)
Rise time 7 ns with 1A1
Sweep Rates 100 ns/div to 5 s/div
External Horizontal Input 100 mV/cm to 10 V/cm, DC to 400 kHz
CRT T5470 (154-0478-00 standard), 10 kV acceleration, 6x10 cm viewing area
Calibrator ~1 kHz, 200 μVp-p to 100 Vp-p
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

Links

Documents Referencing 547

Document Class Title Authors Year Links
Service Scope 45 Aug 1967.pdf Article Time-Domain Reflectometry Theory and the Testing of Coaxial Transmission Lines 1967

Patents that may apply to 547

Page Title Inventors Filing date Grant date Links
Patent US 3453403A Power selection device Eldon Hoffman 1966-08-18 1969-07-01

Internals

Triggering

The 'A' and 'B' triggers are based on a 10 mA tunnel diode. Up to serial number 11889, it uses a TD253. From 11890 onward, it uses a 152-0140-01.

HV Transformer

A common problem with 547s is the HV transformer. Rather than potting the HV transformer in wax, as was done up to that point, the 547's HV transformer was potted in epoxy. Unfortunately, this epoxy turned out to absorb moisture over time, particularly when used in humid climates. The moisture causes increased losses in the transformer.

Excessive losses require the regulator to drive the 6AU5 input oscillator tube (V800) harder. Eventually, the drive circuit cannot supply enough power to keep the supply in regulation. The usual solution is to scavenge a replacement transformer from another scope. As a labor of love, hobbyists have been known to rebuild the HV transformers. This is discussed from time to time on the groups.io (formerly Yahoo) TekScopes forum.

Bernie Schroder has found that the HV transformer degeneration can be slowed considerably by keeping the HV module cool and dry. 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. 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.

After changing to semiconductor diodes, it will be seen that grid pin 7 of V814 will be about 0 volts (fully on, 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).

One way to remedy this is to replace the anode resistor coming off pin 6 of V814 (R803) from 56 kΩ to 82 kΩ. Doing so changes the grid voltage on pin 7 of V814 to a comfortable −0.8 V at switch-on.

Again, this becomes more negative as the losses inside the transformer increase, but not by much if the transformer is healthy.

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.

Vertical Amplifier

The 547 has a five-stage BJT vertical amplifier that is fully differential from the plug-in connector to the CRT vertical deflection plates. 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.

Spoiler Switch

The plug-in bay of the 547 has a "spoiler switch" that only enables the full bandwidth of the 547's vertical signal path when certain relatively modern plug-ins are used, such as the 1A1, 1A2, 1A4, and 1A5.

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. (Spectrum analyzer plug-in Types 1L30 and 1L40 have the hole too but for no reason since their vertical output is low frequency.)

Delay Line

There is a 170 nanosecond delay line between the first and second gain stages.

Power Supply

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.

Multiple secondary windings feed diodes for rectification for different voltages, using both center-tap and bridge configurations. The regulator section uses no transistors, only tubes. There are multiple 6.3 V secondary outputs for heaters, some elevated to different voltage levels based on the section/tube that is supplied, in order to keep the heater-to-cathode voltage level within limits.

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 OG3 VR tube. A 12AX7 is used as the comparator and two 6CW5 in parallel are used as series pass tubes. A 6AU6 is used as an error amplifier. Most other power supply sections in the 547 replicate the same basic design, except slight changes in tubes used: The +225 V and +100 V regulators employ a 6080 as the pass element, and +350 uses a 6CW5.

The plate voltage delay circuit is similar to that found in many may other Tek scopes of the same era. Heater voltage is applied to all tubes immediately when the power switch is turned on. A 6N030T delay tube (P/N 148-0021-00) controls a relay that switches plate supply voltages on only after the tubes are warmed up.

Common Problems

Pictures

547

547 Internals

RM 547

Schematics

Components

Some Parts Used in the 547

Part Part Number(s) Class Description Used in
0G3 154-0291-00 Gas Discharge Tube (Voltage regulator) 85 V voltage reference 132 506 547 560 561 561A 561S 564 565 567 661 TU-4 Z Keithley 610
120-0308-00 120-0308-00 Discrete component high voltage transformer 543B 544 545B 546 547
12AT7 154-0039-00 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 511A 512 513 513D 514 514AD 514D 516 524 529 RM529 544 546 547 556 565 570 3A2 75 3A75 1M1 A B C G H K L ML M N K R S Z Keithley 610B
12AU6 154-0040-00 Vacuum Tube (Pentode) RF pentode 81 112 1L10 1L20 1L60 3L10 512 556 575 545 547 549 581 585 A B C G K H L ML M N O R S Z
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12AX7 154-043 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 513 524 531 531A 535 536 545 545A 545B 546 547 549 555 570 581 581A 585 585A E Q Hickok 1825 Keithley 610
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A Keithley 610
1N3714 152-0081-00 Discrete component 2.2 mA, 25 pF germanium tunnel diode 546 547 556 21A 22A 3B1 3B2 3B3 422 491 283
1N3717 152-0381-00 152-0125-00 Discrete component 4.7 mA, 25 pF tunnel diode 1L40 1S1 1S2 11B1 11B2 11B2A 147A 1470 148 21A 22A 3B4 3B5 408 432 434 453 453A 454 466 491 5T3 544 RM544 546 RM546 547 RM547 556 RM556 7B70 7B71 7D11
2N2207 151-063 151-0063-00 Discrete component germanium PNP transistor 3B1 3B3 3S76 321A 547
5642 154-0051-00 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 310A 316 317 360 453 502 502A 503 504 506 513 515 516 524 529 RM529 533 533A 535 536 543 543A 543B 545 545A 545B 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6197 154-0146-00 Vacuum Tube (Pentode) 7.5 W power pentode 516 531 533 535 535A 547 556 75 3A75
6AU5 154-021 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 513 516 517 517A 531 535 541 535 545 547 581 581A 585 585A
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 60 2A60 72 3A72 3C66 310 310A 316 317 360 502 502A 506 511 511A 512 513 516 517 517A 524 526 529 RM529 531 531A 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6BY8 154-0414-00 Vacuum Tube (Pentode) diode-pentode 547
6CW5 154-0202-00 Vacuum Tube (Pentode) power pentode 132 526 547 General Radio 1124 Telequipment D56
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 111 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
8426 Vacuum Tube (Pentode) RF pentode O 545A 547 549 581A 585A
SMTD995 152-0140-01 Discrete component 10 mA, 8 pF tunnel diode 1S1 1S2 1502 21A 22A 3T5 3T6 475 475A 475M 544 R544 546 RM546 547 RM547 556 R556 581A 585A RM585 7B52 7B53N 7B70 7B71 7D10 7D11 7T11 7T11A R7912 S-51 S-52 TU-5 067-0572-00 067-0572-01 067-0681-00
STD704 152-0125-00 Discrete component 4.7 mA tunnel diode 1L40 1S1 11B1 11B2 11B2A 147 R147 147A R147A 1470 148 R148 148-M 149 R149 149A R149A 21A 22A 3B4 3B5 408 432 434 453 453A 454 464 465 466 491 5T3 544 RM544 546 RM546 547 RM547 556 RM556 7B70 7B71 7D11
T5470 154-0429-00 154-0450-00 154-0451-00 154-0452-00 154-0457-00 154-0458-00 154-0459-00 154-0478-00 154-0478-01 154-0478-02 154-0478-03 154-0568-00 154-0568-01 154-0568-02 154-0568-03 CRT 5" electrostatic deflection CRT 543B 544 545B 546 547
TD202 152-0155-00 Discrete component 2.2 mA, 25 pF tunnel diode 546 RM546 547 RM547
TD253 152-0154-00 Discrete component 10 mA, 9 pF germanium tunnel diode 547 7B70 TU-5
TD714 152-0402-00 Discrete component 2.2 mA, 25 pF tunnel diode 1401 1401A 283 R283 3B2 3B3 422 491 546 RM546 547 RM547 556 RM556 SPG11 SPG12