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Equipment List & Post Guide

As I work through this collection, I am taking photographs and documenting my experiences, the items that are documented are highlighted in blue, clicking on the blue text will take you to the relevant post (I hope).

Here are some pictures of most of this collection:

Here is information on testing, reforming and replacing electrolytic capacitors:


547 (2) (One donated by Walter Clay)
545A (Donated by John Ferrell)
535, 535A
310 & 310a
316 (Donated by Kenneth Kuhn), 317
561A (4), 564B Storage Oscilloscope
214 Miniature Storage Oscilloscope

Tektronix Plug Ins:

500 Series; 1A1 (3), 1A2, 1A4, CA (2), D, M, 53/54B (identical to Type B)

560 Series; Y: 2A63, 3A1 (2), 3A3, 3A6, 3A74
X: 2B67 (3), 3B1, 3B3 (2), 3B4

AN/USM; OS-34/USM-32 (Dumont),  OS-8E/U (Carol Electronics), AN/USM-24, AN/USM-117C, AN/USM-38

Cossor 1035 MKIII

Heathkit; IO-14

ID-22 Beam Switcher

HP; 180A, 180TR, AN/USM281122A, 150A with 152A plug in

Hickok 1805A

Hughes Memoscope 104D

Knight KG-630

Siemens; Oscillarzet 05

Solartron; CT 436, CD 568

Telequipment; S31

Triumph; Oscillograph / Wobbulator 830 (Naval CTU-60018)

Signal Generators (and function generators):

GenRad; 1001-A, 1210-C (with 1201-B PSU), 1217-B (with 1201-B PSU), 1310A

HP; 8601A, 211A, 205AG

Tektronix; 106, 161 + 162 + 163 (with 160A PSU), 190 A&B Constant Amplitude, 191 Constant Amplitude

B&K; 4040A

Dubrow; TS-452C/U (Mechanical wobbulator)

Time Mark Generators: Tektronix; 180A, 181A

Frequency Counter: Tektronix CFC250, HP 500B

Spectrum and Distortion Analysers:

HP; 3580A, 339A, GR 1568-A

Heathkit; IM-5248, SB-620 Scanalyzer, Nelson-Ross; Model -021 (plug in for 561A)

Impedance Bridge: GenRad; 1650A
LC Meter: Tektronix Type 130

Vacuum Tube Voltmeter: TS-375 A/U, HP 400H

Micro Volt-Ammeter: HP 425A

Grid Dip Oscillator: Heathkit; GD-1B

Receiver: Hallicrafters SX-71, Bush AC91

Transceiver: Heathkit; SB-102

Tube Testers: Hickok; 600, Mercury; 1000

DVMs: B&K; 2879 & 2707A, HP; 3468A

Multi-Meter: Triplett 630-NA, AVO8 MKV

Power Supplies:

High Voltage (for tube circuits): HP; 712B, Lambda; Model 71, Kepco; Model 400 (donated by John Dahlman), GE Type TP-13

Low Voltage: HP; 6268, Lambda; LPD 422 FM

  1. Dave Haas permalink


    I’m looking at dozens of old Weston and Westinghouse meters dating from at least as far back as the 1930s, although most are probably from the 50’s.

    Is there anyone who collects/museums these things? I’d like to give them to a loving home or find out if they have any value but I really don’t know how to go about doing this. SO far I haven’t had much luck…lots of sites dedicated to HP, Tek, and yours to “instruments”, but I don’t see anything like the frequency standard calibrated in 1937 that sitting in front of me. Can you point me at anyone who’d be interested?

    • Hi Dave.
      The best suggestion I have is Ebay, if you have the patience. Another possibility is to join there is a classifieds section. There are other similar forums in this genre that may work.
      One of my concerns is preventing my collection from ending up in the landfill when my time comes. This is an issue.
      If you have a list of the items that you have, I could post then here with you email address. Obviously what happens thereafter is up to you.
      Photos are crucial.

  2. Colin Lamb permalink

    Hello Richard:

    I found a USM-32 cathode follower probe in stuff I am cleaning out. It needs a new home and will travel postage paid to a new home. I see you have one of these scopes.

  3. Hi Richard, I like your site & especially your comments. I have an unusual request. I have an old Scott 340A Receiver & want to add a separate FM Multipath monitor. Would my Waterman S-10-A work? I’m told I need a X/Y scope that runs from DC to 50Khz. I can’t afford a McIntosh etc. Nick

    • Hi Nick.
      Thanks for the compliments. I am not familiar with the FM multipath monitor technology and so cannot be of much help. Similarly, I am not familiar with the specification of the Waterman though it is likely that the Y response will be better than 50kHz but will not be DC coupled. Does it have an input to the X-amplifier? If so, Again I would expect 50kHz be within range but not DC. Frankly, the way to go it to try it. Also, I am not sure why DC response is required?

  4. Mark permalink

    I was given three CRTs that I cannot find any specs and would like to know if you have or know of where I can get them. You seem to have better resources than I do for finding information. They are: Electronix Tube Corp. 54DGP11, Dumont F777o-0P31 and 20th Century Electronics Ltd. S6D. The last is from England with the contacts on the outside of the base. The first is a 4 gun, the second is a 2 gun. Both of these have the deflection plates connections going to connectors on the neck. Thanks.

  5. Hello, Richard. I just read with some enjoyment your tale of the 80 meter loop antenna. This caused me to be curious about your other writings, and I discovered your tale of the “Heathkit IO-14” oscilloscope, and your question about why it might have vertical delay lines. I owned this scope for a number of years, and the purpose of the delay lines in the vertical channel was to allow the triggered sweep to get underway and the beam to become un-blanked before the vertical signal deflection began to occur. ( This way the scope could trigger on the rise of a pulse, AND display the entire baseline and rise of the pulse that caused the triggering ). Prior to the Heathkit IO-14 I used an Allied Radio Knight-Kit 5 inch synchronized free-running sweep scope. As a sixth grader, that Knight-Kit scope gave me great insight for many years, but I later learned, in the Air Force, about triggered-sweep scopes and wanted to get a better scope, hence the Heathkit IO-14. Today, I am still using a Tektronix 2215.

    Jerry AB3SX ( retired engineer, 38 yrs DOD + 4 yrs USAF )

    • Hi Jerry.
      I understand the point of the delay line, it is just that the performance of the IO-14 is so poor that the inclusion of delay lines seems to me to have been a selling point, not an actual performance benefit. (I did all that I could to restore the performance without actually replacing all the components!)
      I have a video that compares triggered to repetitive sweep on youtube:

  6. Joy Fulleman permalink

    I have a Tektronix 545 Oscilloscope. Some questions: When unit is powered off and unplugged, are there any areas in the unit that would still be charged or can I touch anything inside w/o danger. Also, how could I at least partially test the unit? It has powered on, fan runs, tubes light up, etc.

  7. Tansu G. permalink

    Dear Richard,

    Your collection is adorable, I have also watched your video on Youtube on “triggering”.
    I could not find a list of the instruments you are willing to sell, and probably not, but just in case, wanted to ask whether you would consider selling the 475 seen on your bench?

    With best wishes, Tansu.

    • Hi Tansu.
      Thanks for your appreciative comment and for adding me as a follower (cathode follower?). I am moving rather slowly on selling though quite a few scopes have gone. I will not be selling the more portable equipment so no, the 475 is not for sale!

  8. Charlie Torre permalink

    Hi Richard,

    Like yourself, I am also an audio / tube amp lover / tinkerer….nothing sounds like a 6SN7.

    Question: I have an old HP 3580A spectrum analyzer (often used for design work…love that 2nd order distortion of triodes!)

    I accidentally left it powered on for a few nights, and now there is no longer a, “trace” (actually there is….but very blurry, wide, and faint).

    Any ideas on where I should begin trouble shooting?….I suspect the power supply, but all, scanned, on-line schematic drawings are unclear…basically un-readable…and I don’t know expected voltages.


    Thank you,

    Charlie T.

    • Hi Charlie.
      I’m sorry that I haven’t replied sooner. Without a doubt the place to begin is to ensure that the correct voltages are present at the power supply test points. To do that you really do need the manual. I obtained mine (which is a copy) from Vintage Manuals,
      The corresponding website is
      I do encourage you to purchase a copy if you are serious about keeping your analyzer working.
      Best luck,

  9. Hi Richard,
    Yes, I did obtain a high quality scanned version of the manual….and after several weeks, finally fixed it… of the IC’s on the digital storage board went bad. It is now functional….not perfect though….for some weird reason, the retrace stops intermittently, and i have to restart it……but I got tied of troubleshooting…….so while not perfect, it is still usable…..
    Take care,
    Charlie T.

  10. Drew Ge permalink

    Hi Richard,

    I have an old pre-WW2 (1930’s) Australian Military Oscilloscope that I’m restoring to working condition (hopefully!) It powers on and have only a stationary “dot” – there appears to be no time base function.
    Has a 884 thyraton valve in conjunction with 6J7G amplifiers (x2 – horizontal /vertical). The main cathode-ray tude is refer to as “902” (~1″ screen).
    Would you be familiar with this arrangement?

    Drew G

    • Hi Drew.
      What you describe is pretty typical of the era. Check out my post on the Triumph wobbulator / scope. Does the spot jump when you change the TB range? Replace all the coupling caps, they will be leaky. Ditto the TB range caps.

    • Further to: if the spot jumps when you change the TB range, just replace one of the range caps and see what happens. If the caps are very leaky the TB won’t run. If they are leaky at all, the linearity will be poor.

  11. Drew Ge permalink

    Hi Richard,
    Thank you for the M830 reference – it will be handy as I’m “reverse engineering” the circuit diagram from scratch.
    The spot only jumped horizontally when adjusting the horizontal gain.
    Focus works
    Intensity works
    Horizontal /vertical positioning (centering) works.

    Very interesting point re the CAP replacement – I was initially going to source /replace some of the VTs (as I don’t have a value tester to rule out a faulty VT).

    First step is the cct diagram………………

    Thank you


    • A couple of things:
      The shifts are almost certainly applied directly to the CRT, the X and Y amps being ac coupled to the CRT. Most likely. That the spot jumped when adjusting the horizontal gain probably means the X amp is doing something at least. If you have followed much of my blog, you will know that I am a great fan of Caig Products, specifically Deoxit (for all contacts including tube sockets) and Fader Lube for carbon track pots.
      You probably know this by don’t leave a stationary spot focussed, it will burn the phosphor.
      Good luck sleuthing! It can be both frustrating and rewarding.

  12. Drew Ge permalink

    Hi Richard,

    Found a copy of the cct diagram – the oscilloscope is a AWA model 3R6673

    (Had about 50% done until then)

    Googling found Ray Robinson site, which has the circuit diagram.

    (search for “R6673”)

    Further, he states that it is described in “AWA Technical Review No3 (1941).

    Any ideas on how to get a copy of this?


    • Hi Drew.
      This is a classic design and exactly what I expected being almost identical to the scope section of the Triumph wobbulator. Thanks for the link, I think that I will add it to my links section.
      Sorry, I do not know how to find the Tech Review that you cited.

  13. Drew Ge permalink

    Hi Richard,

    Where would you recommend to get some replacement high voltage rating capacitors from?

    From the RCA 902 CRT application note, should be around the 500V mark.

    (also for resistors).

    Thank you .

    Kind Regards,

    • Hi Drew.
      500V is not particularly high, 630V is a common rating for film caps of various types, polypropylene being a good choice. Most electronic factors should list them otherwise, I buy most of mine from Antique Electronic Supply at
      Ceramic caps of small value are readily available at ratings of 4000V or so. I sometimes risk buying components from eBay. The risk is that they are likely Chinese and while I have never had a problem, some say that the quality control may be dubious. For larger values up to 60uF or so, motor-run oil filled polypropylene caps can be an excellent choice, albeit a little expensive. Panasonic may an excellent range of electrolytics at various voltage ratings up to I think 630V.

  14. John Vengrouskie permalink

    Richard, I’ve wandered through the amazing forest of topics here and am just amazed.
    I’m clearin ga long list of ‘projects’ that likely will not really ever get done, and one is a 535A on a cart with second plugin that I rescued decades ago. It is ex-NASA and worked when I initially got it. Hasn’t powered up in 15 years or more. If I read right, they are now more use as restoration-projects or parts donors. I’m in the DC area and would like to see this go SOMEWHERE appreciated if at all possible. Any advice…?
    I now have ANOTHER place to spend some good time reading widely… you have built a fine little place here (BTW: where’s the bar… and then, is there a reading chair by the fireplace…?)

    • Wow, what a lovely comment! Thanks John.
      I really don’t know what to say about the 535A. It is not of any real use these days and I’m trying to reduce my collection!
      You might try Volker Klocke at the Oscilloscope Museum;
      Sorry, I’m not clever enough to provide a virtual bar, fireplace and armchair.
      Best wishes,

  15. Doug permalink

    i have a tek 317 with a problem. the scope woks fine except for the intensity control. it has no effect on the trace brightness. have checked all the voltages per manual. all seem fine but the 400v supply is running high about 450v. checked pot (intensity control) with ohm meter is checks ok. the voltage across it varies from +40v full ccw to 0v full cw. seems to me that this voltage should go neg to lower the beam brightness. have replaced several caps in the crt section but didn’t change anything. any help would be welcome. thanks kv8e

    • Off the top of my head it sounds as though the grid – supply isn’t present.
      This has a separate widing and rectifier from the cathode supply. The rectifier is V824.


  16. Paul permalink

    Hi. Picked up a signal generator TS-452C/U. Part of a big collection of tube stuff i purchased at a local estate. This unit turns on and seems to be functional but i am not into testing or even have a tenth of the knowledge you all have. Trying to decide on parting this unit out or find someone who would like to purchase. What are your thoughts? Thanks. Paul

    • Hi Paul.
      I honestly don’t know what’s best. I need to liquidate my collection and that’s likely to prove a bigger job than all the repairs and blogging!

  17. Hi Richard,
    I found a bottom plate to an unknown military RF sweep generator, and Behold! It has a schematic label on it that looks like the same schematic as that of the TS-452C/U shown on your wordpress site here, except for a few very small changes (i,.e. 6SN7 vs 6SL7, mains input filter, etc.).

    It may be a different version but is obviously the same instrument. I believe there is one of these TS-452’s or something just like it in the back of the lab on a shelf, but we never had the schematic for it until I found yours. Now that bottom plate showed up in a pile of junk from an estate!

    If you would like a nice clean scan of this schematic version to share for the sake of more information, I could send it to you. WordPress should give you my e-mail address, or you can find it as the admin contact at

    When time permits I should take pictures of my generator. These are great instruments. It is not working at this time but is repairable. Too many projects.

    I understand about cutting back on the collections from your reply to Paul in which you said, “liquidate my collection”.
    I have been considering these two companies for the same purpose here, but know no more about them than is on their sites.
    If you find a decent solution that provides reasonable return and keeps worthwhile or unusual gear out of the landfil, let us know!

    best regards,
    Patrick Jankowiak

    • Hi Patrick and thanks for your interesting and thoughtful comment. I’ll be checking out the suggestions you have offered.

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