I have this Weston(?) TV-4A/U tube tester which is part of a US Navy - Test-Tool Set - AN/USM-3A and really need a schematic for it.
No tube in it. I've found a manual and tube data but no schematic. Any one have a lead on one?

Also looking for the headphone and band for it. Everything else seems to be complete except for the tools. All major components are there.

One more thing, the case says "Radio Frequency Labs". Is this TV-4 made by them or by Weston? It does have a Weston meter. Maybe just packaged by Radio Frequency Labs?

Thanks,
Ron

TV-4 A/U emission tester.



http://www.radiomuseum.org/r/weston_tv_ ... ester.html


Weston TV-4 emission tester.
https://books.google.co.uk/books/conten ... yHA&w=1280
from: Tube Testers and Classic Electronic Test Gear by Alan Douglas.

Alan once described this model as being quirky!

Technician's handbook AN / USM-3 (no schematic).
http://www.mrcgwest.org/mrcgdownloads/Misc/ANUSM3.pdf

Greg.

Edit:
From 2008 https://vintage-radio.net/forum/showthread.php?t=27731
I've sent you Phil's email address via PM (private message).

Thanks Greg,
I have sent Phil an email regarding the schematic and parts too.

I have downloaded the same books you linked to but yeah, no schematic. I can't even find out what the number of the tube is that's missing !

Regards,

Ron Taylor
Houston, TX

The tube in the tester is a...

3A4 Power Amplifier Pentode.
Data: http://www.r-type.org/pdfs/3a4.pdf

pdf-page-eight of NAVSHIPS 91688
http://skywaves.ar88.net/mil/USM-3A/Section_1.PDF
pdf looks incomplete. hi hi

As the 3A4 and the other tubes for the signal tracer have been given reference designations V-101 and V-201 V-202 V-203 this may be where the elusive schematic once was?


The above NAVSHIPS pdf was hosted by Richard Allan here...
http://www.richardsradios.co.uk/testtoolset.html

Perhaps he has the schematic?

Greg.

Hi,
I'm still in search of a full manual for my AN/USM-3A.
I have the "section 1" but it is incomplete.
The full manual seems to be the NAVSHIPS 91688 or the NAVSHIPS 91146
Does anybody know where can I find it?
A free PDF is obviously preferred, but I'll pay a reasonable fee for it.
Thanks,
Paolo from Italy

I wonder if the above gentleman ever found the schematic for this tester. I need one too. Thank you.

I have a full scan of the manual that's mostly clear, but there is no schematic for the tube tester in it. I think I found it on another site specializing in old military equipment manuals. In researching this tester over the years, I found somewhere that it's basically a Weston 777. After seeing a few 777's since then, I'd say they're pretty close. I did the routine preventative service on the TV-4AU I have a few years ago but don't recall there being that much to replace as far as a re-cap goes. I've had it in periodic service both before and since and it seems to work properly.

I have the Weston 777 instruction manual, schematic, and a spreadsheet from Nolan E. Lee from 2002 that has some extra information and a compilation of setups between the data available for the 777 and TV-4/AU. I'm not sure if there's an updated version of that spreadsheet or not. I can try to upload my copies of the information if you're still in need.

Alternatively: you can pull up the March 1941 issue of Service Magazine from the World Radio History (formerly American Radio History) website and get it that way too. It's on page 16 of the issue. There's also a write-up of the circuit that finishes on page 24 of the same issue.

One thing to note: the TV-4/AU has spare sockets built in, so it will have more than what's shown on the 777 schematic. IIRC, they're un-wired in the TV-4.

Hi,
Thanks for your help. I was trying to locate the Service Magazine on the World Radio History website, but I'm not familiar with that website and I cannot locate it.
Can you send me a link to that page?
Thanks,
Paolo

You can get the entire issue here: https://worldradiohistory.com/Archive-Service-Magazine/40s/Service-1941-03.pdf

If the PDF doesn't load properly in your browser, you can right-click the link and download it (I usually do to save them on bandwidth).

Thanks! very appreciated!
Paolo