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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:

Oscilloscopes:

Tektronix:
511A
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
475

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

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

25 Comments
  1. Dave Haas permalink

    Hi,

    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 vintageradio.com 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.
      Richard

  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?
      Richard

  4. Mark permalink

    Richard,
    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.
    Mark

  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: https://www.youtube.com/watch?v=ql1_zJjrNww
      Best,
      Richard

  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!
      Richard

  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.

    Suggestions?

    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, sales@w7fg.com
      The corresponding website is http://www.w7fg.com
      I do encourage you to purchase a copy if you are serious about keeping your analyzer working.
      Best luck,
      Richard

  9. Hi Richard,
    Yes, I did obtain a high quality scanned version of the manual….and after several weeks, finally fixed it…..one 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?

    Thanks
    Cheers
    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.
      Richard

    • 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

    Cheers
    Drew

    • 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.
      Richard

  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.

    http://www.tuberadio.com/robinson/Australian_radios/

    (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?
    Thanks

    Cheers
    Drew

    • 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.
      Richard

  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,
    Drew

    • 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 tubesandmore.com
      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.
      Richard

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