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{{Oscilloscope Sidebar|
{{Instrument Sidebar  
title=Tektronix 575 |
|manufacturer=Tektronix
image=Tek 575 8250.JPG |
|class=Curve Tracer
caption=Tektronix 575 |
|model=575
introduced=1957 |
|summary=Curve tracer for transistors
discontinued=(?) |
|image=Tek_575-Front-Trace.jpeg
summary=Transistor Curve Tracer |
|caption=Tektronix 575  
manuals=
|introduced=1957  
* [http://bama.edebris.com/download/tek/575-175/tek%20575%20&%20175.v6.pdf Tektronix 575 and 175 Manual (PDF)]
|discontinued=1972
* [http://w140.com/tek-575-122c.pdf Tektronix 575 with Mod 122C Manual (PDF)]
|designers=John Kobbe
* [http://w140.com/tektronix_575_mod_122c_modifications.pdf Mod 122C Kit Manual (PDF)]
|manuals=
* [[Media:070-255.pdf|Tektronix 575 and 175 Manual]]
* [[Media:tek-575-122c.pdf|Tektronix 575 with Mod 122C Manual]]
* [[Media:Tek 575 rackmount.pdf|Tektronix 575 rackmount images]]
 
<small>
'''Modifications'''
* [[Media:Tek_575_Mod_Summaries.pdf|Tektronix 575 Modification Summaries]] / <small> [[Media:Tektronix575ModSummaries.pdf|Tektronix 575 Modification Summaries]]</small>
* [[Media:Tektronix_575_mod_122c_modifications.pdf|Mod 122C Kit Manual]]
* [[Media:Tek 575mod122c correspondence.pdf|Correspondence Regarding 575 Mod 122A and C]]
* [[Media:Tek 575 mod 122D.pdf|Modification 122D]]
* [[Media:Tek 575 mod 122c description 1961.pdf|Tektronix 575 Mod 122C Description 1961]]
* [[Media:Tek 575 mod 122c description 1961.pdf|Tektronix 575 Mod 122C Description 1961]]
* [[Media:Tek 575 122c instructions for custom instruments.pdf|Tektronix 575 Mod 122C Instructions for Custom Instruments]]
* [[Media:Tek 575 122c instructions for custom instruments.pdf|Tektronix 575 Mod 122C Instructions for Custom Instruments]]
* [[Media:Tek 575 mod 122c instructions.pdf|Tektronix 575 Mod 122C Instructions]]
* [[Media:Tek 575 mod 122c instructions.pdf|Tektronix 575 Mod 122C Instructions]]
* [[Media:Tek 575 122c parts list.pdf|Tektronix 575 Mod 122C Parts List]]
* [[Media:Tek 575 122c parts list.pdf|Tektronix 575 Mod 122C Parts List]]
* [http://w140.com/tek_fcp/tek_575_fac_cal.pdf Tektronix 575 Factory Calibration Procedure (PDF)]
* [http://w140.com/tek_3-terminal_adapter_013-0069-00.pdf 013-0069-00 3-Terminal Adapter (PDF)]
* [[Media:Nuvistor checking procedure with 575.pdf|Nuvistor Checking Procedure with 575 (PDF, needs OCR)]]
* [[Media:040-0223-00.pdf|Mod M5272: Silicon Rectifier]]
* [[Media:040-0223-00.pdf|Mod M5272: Silicon Rectifier]]
* [[Media:040-0276-00.pdf|Mod 122C: Increased collector volts]]
* [[Media:050-0021-00.pdf|Mod M2058, M10070, M8244: Base Step Generator Polarity Switch Replacement]]
* [[Media:050-0021-00.pdf|Mod M2058, M10070, M8244: Base Step Generator Polarity Switch Replacement]]
* [[Media:050-0070-01.pdf|Mod M6375: Transistor Selector Switch Replacement]]
* [[Media:050-0070-01.pdf|Mod M6375: Transistor Selector Switch Replacement]]
Line 27: Line 35:
* [[Media:050-0383-00.pdf|Mod M12361: Horizontal and Vertical Amplifier Tube Replacement]]
* [[Media:050-0383-00.pdf|Mod M12361: Horizontal and Vertical Amplifier Tube Replacement]]
* [[Media:Jan 1959 tek 575 fcp with cal check.pdf]]
* [[Media:Jan 1959 tek 575 fcp with cal check.pdf]]
* [[Media:Tek 575 rackmount westinghouse.pdf|Rackmount 575]]


'''Calibration'''
* [[Media:tek_575_fac_cal.pdf|Tektronix 575 Factory Calibration Procedure]]
* [[Media:tek_3-terminal_adapter_013-0069-00.pdf|013-0069-00 3-Terminal Adapter]]
* [[Media:Tek 575 cal outline.pdf]]


'''Miscellaneous'''
* [[Media:Nuvistor checking procedure with 575.pdf|Nuvistor Checking Procedure with 575]]
* [[Media:575_Usage_-_Some_Transistor_Measurements_Using_the_575.pdf|Some Transistor Measurements Using the Type 575]]
* [[Media:Tek 175 higher voltage discussion.pdf|Discussions of Modification to 575 for Higher Voltage]]
* [[Media:Tek 575a discussion.pdf|Discussion of Possible 575A]]
</small>
}}
}}
The '''Tektronix 575''' is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]].
The '''Tektronix 575''' is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]].
It can be thought of as being composed of three modules:
 
an X-Y display, a step source, and a collector sweep source.
It can be thought of as being composed of three modules: an X-Y display, a step source, and a collector sweep source.
 
Unlike later curve tracers, the 575 can optionally display base voltage on the vertical axis.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Collector Sweep | 0−200 V minimum peak with 1 A current curves, 0−20 V minimum peak with 20 A current curves }}
{{Spec | Collector Sweep     | 0−200 V minimum peak with 1 A current curves, 0−20 V minimum peak with 20 A current curves }}
{{Spec | Vertical Display | plots collector current from 0.01 mA/div to 1 A/div ±3% in 16 Steps }}
{{Spec | Vertical Display   | I<sub>C</sub> 0.01 mA/div to 1 A/div ±3% in 16 Steps, or U<sub>B</sub> 0.01 V/div to 0.5 V/div ±3% in 6 Steps }}
{{Spec | Vertical Display | plots base voltage from 0.01 V/div to 0.5 V/div ±3% in 6 Steps }}
{{Spec | Horizontal Display | U<sub>C</sub> 0.01 V/div to 20 V/div ±3% in 11 Steps, or U<sub>B</sub> 0.01 V/div to 0.5 V/div ±3% in 6 Steps }}
{{Spec | Horizontal Display | plots collector voltage from 0.01 V/div to 20 V/div ±3% in 11 Steps }}
{{Spec | CRT                 | [[T0520]], P1 phosphor, P2/P7/P11 on request; 4.2 kV acceleration }}
{{Spec | Horizontal Display | plots base voltage from 0.01 V/div to 0.5 V/div ±3% in 6 Steps }}
{{Spec | Power              | 105−125 V or 210−250 V<sub>AC</sub>, 50 to 60 Hz; 200 W in standby, 400 W max; thermal cutoff}}
{{Spec | CRT | T52P, P1 phosphor, P2/P7/P11 on request ; 4.2 kV acceleration }}
{{Spec | Size               |  (W/L/H) 13" × 24" × 16¾"  }}
{{Spec | Line voltage | 105−125 V or 210−250 V<sub>AC</sub>, 50 to 60 Hz }}
{{Spec | Weight             | ~30 kg (70 lb) }}
{{Spec | Power | 200 W in standby, 400 W max − Actual consumption based on transistor being tested }}
{{Spec | Size |  (W/L/H) 13" × 24" × 16¾"  }}
{{Spec | Weight | ~30 kg (70 lb) }}
{{Spec | Cooling  | AC Fan }}
{{Spec | Construction  | Aluminum alloy chassis, anodized front panel, blue vinyl coated cabinet }}
{{EndSpecs}}
{{EndSpecs}}
==Links==
* [https://lazyelectrons.wordpress.com/2018/10/13/tektronix-575-curve-tracer-restore/ A Tek 575 Restoration with video]
* [https://w140.com/tek_575_use.pdf ''A Power Curve Tracer At Surplus Prices''], by [[Dennis Feucht]]
* [https://www.oscilloscopemuseum.com/oscilloscope-tektronix-575-s1957.html Tek 575 @ oscilloscopemuseum.com]
* [https://techchannel.att.com/play-video.cfm/2011/7/1/AT&T-Archives-Microworld Tek 575 in AT&T film "Microworld" (1976)] at ~6:00
* [http://www.ke5fx.com/A_VTCT_Adapter_for_All_Tektronix_SCTs_W7PF.pdf Dennis Tillman: An Inexpensive Vacuum Tube Curve Tracer Adapter for All Tektronix Semiconductor Curve Tracers]
* [https://www.youtube.com/watch?v=Ix7ju0Q8YZg Zenwizard Studios - Curve Tracer Basics]
* [https://www.youtube.com/watch?v=Wpok66re3G0 Zenwizard Studios - Zen's Curve Tracer Buying Guide]
{{Documents|Link=575}}
{{Documents|Link=Curve tracers}}


==History==
==History==
[https://vintagetek.org/my-early-tektronix-days-by-john-kobbe-2/ John Kobbe says]:
[https://vintagetek.org/my-early-tektronix-days-by-john-kobbe-2/ John Kobbe says]:
<blockquote>
<blockquote>
While I was working on the 540 series vertical amplifier, Virgil Briton, whose bench was next to me, had put together a vacuum tube curve tracer using stepping relays and other mechanical devices. I remember thinking that, that was a neat display even if it did a lot clicking and was slow. After putting the cross hatch generator together, I knew it would be very easy to do the curve tracer electronically,it started for in house use,but after putting a self-contained instrument together, Tek decided to call it 575 and sell it.
When transistors started to become practical, Tek sent [[Bill Polits]] to Michigan, for a 2 week primer on transistors.
He in turn communicated it to the rest of us who were interested. That called for a transistor curve tracer.
It used a similar step generator as the tube curve tracer but otherwise needed mostly new circuits.  
I remember a day at the beach, I was trying to hide from the sun while everyone else was getting their sunburn.  
I dug the sand out from under our new 1954 Chevy, got comfortable and figured out the circuits for the curve tracer soon to become the 575.
[[Deane Kidd]] did the hard part when he designed the switches.
</blockquote>
</blockquote>
==Internals==
==Internals==
=== X-Y display ===
=== X-Y display ===
Line 90: Line 124:
Early 575 versions used [[selenium rectifiers]].
Early 575 versions used [[selenium rectifiers]].
A kit for conversion to silicon diodes was available and is documented in the back of the manual.   
A kit for conversion to silicon diodes was available and is documented in the back of the manual.   
===CRT===
The 575 uses the Tektronix [[T0520]] CRT.
The 575 has a [[thermal cutoff]]. 


== Type 175 High Current Adaptor ==
== Type 175 High Current Adaptor ==
[[File:Tek 575 on 175.jpg | thumb | right | 575 on top of a [[175]]]]
[[File:Tek 575 on 175.jpg | thumb | right | 575 on top of a [[175]]]]
The 575 can be paired with a [[175]] for high current device measurements.
The 575 can be paired with a [[175]] for high current device measurements.
==Links==
* [https://lazyelectrons.wordpress.com/2018/10/13/tektronix-575-curve-tracer-restore/ A Tek 575 Restoration with video]
* [http://w140.com/tek_575_use.pdf "A Power Curve Tracer At Surplus Prices" by Dennis L. Feucht (PDF)]
* [http://www.oscilloscopemuseum.com/oscilloscope-tektronix-575-s1957.html Tek 575 @ oscilloscopemuseum.com]
* [http://techchannel.att.com/play-video.cfm/2011/7/1/AT&T-Archives-Microworld Tek 575 in AT&T film "Microworld" (1976)] at ~6:00
* [http://www.ke5fx.com/A_VTCT_Adapter_for_All_Tektronix_SCTs_W7PF.pdf Dennis Tillman: An Inexpensive Vacuum Tube Curve Tracer Adapter for All Tektronix Semiconductor Curve Tracers]


==See Also==
==See Also==
* [[067-078]]
* [[067-078]]
* [[Nuvistor Checker-Balancer]]


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 575 npn traces.jpg
Tek_575-Front-Trace.jpeg | NPN Trace
Tek 575 tq.jpg |575 w/o Mod 122C
Tek 575 tq.jpg |575 w/o Mod 122C
575_122C.JPG|575 w Mod 122C
575_122C.JPG|575 w Mod 122C
Tek 575 left.jpg
Tek_757_Cart.jpg | 575 In a Cart
Tek 575 right.jpg
Tek 575 mod 118 1.jpg|Tektronix 575 Mod 118
Tek 575 mod 118 2.jpg|Tektronix 575 Mod 118
USA Tektronix 575 Front RAW.jpg
Tek 575 8250.JPG
Tek_575-Top.jpeg | Top
Tek_575_Chart.png | 575 Load Resistance Chart
Tek 575 top.jpg
Tek_575-Rear.jpeg | Rear
Tek 575 rear.jpg
Tek_575_TestPanel.jpg | 575 Test Panel
Tek_575_TestPanel.jpg | 575 Test Panel
Tek 575 transistor sockets.jpg | Test Sockets
Tek 575 pnp trace.jpg
Tek 575 pnp trace.jpg
Tek 575 8250.JPG
Tek_757_Cart.jpg | 575 In a Cart
Tek 575 display.jpg
Tek 575 display.jpg
Tek 575 tunnel diode.jpg|575 testing a tunnel diode
Tek 575 tunnel diode.jpg|575 testing a tunnel diode
Line 126: Line 159:
Tek_575_5651_VRCurve.jpg | 5651 VR Tube in 575
Tek_575_5651_VRCurve.jpg | 5651 VR Tube in 575
Tek_575_NPN-hfe_Curve.jpg | hFE curve of a 2N3904 in 575
Tek_575_NPN-hfe_Curve.jpg | hFE curve of a 2N3904 in 575
Tek 575 top.jpg
Tek 575 with 175.jpg|575 with 175
</gallery>
===Internal===
 
<gallery>
Tek_575_NoCRT.jpg | Front without CRT
Tek_575-Internal-Top.jpeg | Internal Top
Tek_575_Top.jpg | Top View without Support Bar
Tek_575_Top.jpg | Top View without Support Bar
Tek-575-Internal-Bottom.jpeg | Internal Bottom
Tek_575-Internal-RHS.jpeg | Internal RHS
Tek_575-Internal-LHS.jpeg | Internal LHS
575 int 1.jpg
575 int 2.jpg
575 int 3.jpg
USA Tektronix 575 InsideR0.jpg
Tek 575 left.jpg
Tek 575 right.jpg
Tek_575-HVSection.jpeg | HV Section
Tek 575 hvps 1.jpg  | High-Voltage Power Supply
Tek 575 CollectorSweep.jpg | Collector sweep germanium rectifier and dissipation resistor stack
Tek_575_Rectifier.jpg | Rectifiers - Silicon Diode Version
Tek_575_Rear_FanRmvd.jpg | Rear View, Air-filter/Fan Removed.
Tek_575_CRTConn.jpg | Def Plate  Connections
575 int 4.jpg
575 int 5.jpg
Tek 575 internal.jpg
Tek 575 internal.jpg
Tek 575 Side.jpg | Internal Side View
Tek 575 Side.jpg | Internal Side View
Tek 575 rear.jpg
Tek_575_Underside.jpg | Bottom#1
Tek_575_Underside.jpg | Bottom#1
Tek 575 bottom.jpg  | Bottom#2
Tek 575 bottom.jpg  | Bottom#2
Tek 575 bottom rear.jpg  | Bottom Rear
Tek 575 bottom rear.jpg  | Bottom Rear
Tek_575_Chart.png | 575 Load Resistance Chart
Tek 575 hvps 1.jpg  | High-Voltage Power Supply
USA Tektronix 575 Front RAW.jpg
Tek_575_NoCRT.jpg | Front without CRT
USA Tektronix 575 InsideR0.jpg
Tube_154-0343-00.jpg | CRT of 575, Type [[T0520]]
Tube_154-0343-00.jpg | CRT of 575, Type [[T0520]]
Tek 575 CollectorSweep.jpg | Collector Sweep Germanium Rectifier and Dissipation Resistor Stack
Tek_575_Rectifier.jpg | Rectifiers - Silicon Diode Version
Tek_575_CRTConn.jpg | Def Plate  Connections
Tek_575_Rear_FanRmvd.jpg | Rear View, Air-filter/Fan Removed.
575 int 1.jpg
575 int 2.jpg
575 int 3.jpg
575 int 4.jpg
575 int 5.jpg
Tek 575 transistor sockets.jpg
Tek 575 npn traces.jpg
Tek_575_Live.jpg | Inside view of a live 575
Tek_575_Live.jpg | Inside view of a live 575
Tek 575 mod 118 1.jpg|Tektronix 575 Mod 118
Tek 575 mod 118 2.jpg|Tektronix 575 Mod 118
</gallery>
</gallery>
===Schematics===
===Schematics===
Line 164: Line 201:
Tek 575 crt circuit.png|CRT Circuit
Tek 575 crt circuit.png|CRT Circuit
</gallery>
</gallery>
==Components==
{{Parts|575}}


[[Category:Curve tracers]]
[[Category:Curve tracers]]

Latest revision as of 05:41, 14 March 2024

Manuals – Specifications – Links – Pictures

The Tektronix 575 is a curve tracer for transistors, introduced in March 1957.

It can be thought of as being composed of three modules: an X-Y display, a step source, and a collector sweep source.

Unlike later curve tracers, the 575 can optionally display base voltage on the vertical axis.

Key Specifications

Collector Sweep 0−200 V minimum peak with 1 A current curves, 0−20 V minimum peak with 20 A current curves
Vertical Display IC 0.01 mA/div to 1 A/div ±3% in 16 Steps, or UB 0.01 V/div to 0.5 V/div ±3% in 6 Steps
Horizontal Display UC 0.01 V/div to 20 V/div ±3% in 11 Steps, or UB 0.01 V/div to 0.5 V/div ±3% in 6 Steps
CRT T0520, P1 phosphor, P2/P7/P11 on request; 4.2 kV acceleration
Power 105−125 V or 210−250 VAC, 50 to 60 Hz; 200 W in standby, 400 W max; thermal cutoff
Size (W/L/H) 13" × 24" × 16¾"
Weight ~30 kg (70 lb)

Links

Documents Referencing 575

Document Class Title Authors Year Links
Service Scope 50 Jun 1968.pdf Article Measuring FETs with a Type 575 1968
Tekscope 1969 V1 N5 Oct 1969.pdf Article Troubleshooting the Sweep Ciruits Charles Phillips 1969
Tekscope 1975 V7 N3.pdf Article A Potpourri of Modifications and Service Hints 1975

Documents Referencing Curve tracers

Document Class Title Authors Year Links
062-1009-00.pdf Book Measurement Concepts: Semiconductor Device Measurements John Mulvey 1969
Tekscope 1969 V1 N1 Feb 1969.pdf Article Curve Tracing Displays 1969
Tekscope 1969 V1 N5 Oct 1969.pdf Article Troubleshooting the Sweep Ciruits Charles Phillips 1969
Tekscope 1972 V4 N3 May 1972.pdf Article Semiautomatic Testing with the Curve Tracer Jack Millay 1972
Tektronix Curve Tracers - Device Testing Techniques.pdf Book Tektronix Curve Tracers - Device Testing Techniques 1985

History

John Kobbe says:

When transistors started to become practical, Tek sent Bill Polits to Michigan, for a 2 week primer on transistors. He in turn communicated it to the rest of us who were interested. That called for a transistor curve tracer. It used a similar step generator as the tube curve tracer but otherwise needed mostly new circuits. I remember a day at the beach, I was trying to hide from the sun while everyone else was getting their sunburn. I dug the sand out from under our new 1954 Chevy, got comfortable and figured out the circuits for the curve tracer soon to become the 575. Deane Kidd did the hard part when he designed the switches.

Internals

X-Y display

The vertical and horizontal amplifiers are very similar, using the two halves of a 6CG7 dual-triode tube as the output amplifier. The CRT has −1700 V on the cathode and +2500 V on the anode. The HV power supply uses two 5642 rectifier tubes.

It is possible to use the 575 as an X-Y monitor. The vertical and horizontal range switches have settings for external input, at 0.1 V/div sensitivity.

Step Source

This uses a gated Miller integrator to generate controlled steps. The result is a staircase waveform, which generates different traces in the family of I-V curves of the transistor.

Power Supplies

The 575 contains three separate power supplies:

  • A main power supply around T601 (120-095 and, later, 120-0095-01), supplying power to the amplifiers and step generator in the 575.
This power supply follows the standard 500-series power supply design.
In addition to heater power, it provides −150 V, +100 V, +300 V regulated and +400 V unregulated output.
It uses a mix of tubes and silicon or selenium rectifiers (earlier S/N) for rectification.
The −150 V and +400 V unregulated/+300 V regulated rails are supplied through 6BW4 full wave rectifier tubes, the +100 V circuits through silicon diodes/selenium rectifiers.
The −150 V rail is the main reference supply. Its regulator uses a 5651 voltage reference, a 6AN8 as the comparator/error amplifier, and a 12B4 as series pass tube.
The +100 V regulator uses a 6080 series pass tube and a 6AU6 tube as the error amplifier.
The +300 V regulator is similar to the +100 V circuit, except that it uses a 12B4 series pass tube.
Unregulated +400 V is provided for the CRT HV Oscillator.
  • A high-voltage supply around T801, supplying the CRT voltages, +2300 V for the CRT anode and −1700 V for the CRT cathode.
This HV power supply uses a 6AQ5 as the HV oscillator tube, and a 12AU7 as the feedback/error amplifier.
  • A collector sweep supply for the device under test.
Power from the mains goes through an isolation transformer (T701) and a variac (T702) and is rectified by germanium diodes to produce the collector sweep voltage.
The isolation transformer has two pairs of secondary taps, one for high voltage (0 to 200 V) and low current, the other for low voltage (0 to 20 V) and high current.
The maximum power that can be delivered to the transistor in either mode is approximately 200 Watts.
575s with Mod 122C offer extended collector sweep voltage to 400 V.

Rectifiers

Early 575 versions used selenium rectifiers. A kit for conversion to silicon diodes was available and is documented in the back of the manual.

Type 175 High Current Adaptor

575 on top of a 175

The 575 can be paired with a 175 for high current device measurements.

See Also

Pictures

Internal

Schematics

Components

Some Parts Used in the 575

Part Part Number(s) Class Description Used in
120-0095-01 120-0095-01 Discrete component power transformer 575
120-226 120-226 Discrete component 117 V/1700 V power transformer 575 560-Series Diode Curve Tracer
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
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
6AN8 154-078 154-0078-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 310 310A 316 317 360 502 502A 516 517 517A 526 565 570 575 N
6AQ5 154-017 154-0017-00 Vacuum Tube (Pentode) beam pentode 310 310A 316 360 507 511A 512 517 517A 524 536 570 575
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
6BW4 154-0119-00 Vacuum Tube (Dual Diode) dual diode 126 502 502A 524 575
6CG7 154-0134-00 Vacuum Tube (Dual Triode) dual triode 3C66 575 Q
T0520 154-0093-00 154-0097-00 154-0102-00 154-0103-00 154-0129-00 154-0162-00 154-0176-00 154-0343-00 CRT 5" CRT 525 532 570 575