[MRCA] Mystery Project PVC

[Ray Fantini]

The Navy MX1258 kit  has an adapter that works with the 1625 along with adapters for big tubes like the 813 or 803 along with the regular seven, nine and eight pin tubes, thought everyone had one of them being they were quite common at Ham Fest ten years or so back.  From what I remember I think I paid around $10 for the one I have that came with all the adopters and case but not the book.  Just looked on eBay and they are apparently selling for stupid money today with the only ratted out one on eBay now asking like $139.00 and a quick search of the web showing nice looking examples selling for over $200.00
Over the years I have built up a good collection of the small Navy test sets including the 1625 Adapter Test Set, the PRM-10 Grid Dip meter, PSM-1 Megger, URM-25 Signal Generator, ME-9 Multimeter and a OS-8 Scope. The Navy produced a whole fleet of small portable test equipment that can be used on a number of jobs around the shop, that’s in addition to the larger regular test sets and test equipment.
I have a lot of the larger stuff too, like my TV-10 tube tester or the very old but very functional OQ-3 that’s maybe one of the hardest tube testers to use along with newer stuff like the SG-376 Two tone generator for SSB work but the line of small multipurpose gray case test equipment is always a go to when working on vacuum tube equipment.
The AN/USM-3 Test Tool Set always looked like a fun package, tube tester, signal generator and tracer, hand tools and sub box. There is nothing I would need it for or use it other then the wow factor of owing one. Have to wonder how and where they were assigned by the Navy and interesting to see that no other branch of the military never did near the amount of small general use test equipment.

Ray F/KA3EKH

From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf Of J Mcvey via MRCA
Sent: Saturday, March 27, 2021 1:59 PM
To: Military Radio Collectors Association <mrca at mailman.qth.net>; B. Smith <smithab11 at comcast.net>
Subject: Re: [MRCA] Mystery Project PVC

CAUTION: This email originated from outside of Salisbury University. Please exercise caution when clicking links or opening attachments from external sources.

yup, I have commercial versions for octal, loctal, 7 and 9 pin miniatures.
They come in handy occasionally.
I never saw a commercial version of the test socket for the earlier "variable sized" pin bases. ( is there a proper name for those?).
So, I guess you have to roll your own!

On Saturday, March 27, 2021, 11:54:19 AM EDT, B. Smith <smithab11 at comcast.net<mailto:smithab11 at comcast.net>> wrote:


Looks like J Mcvey figured out the mystery project - - he obviously does a lot of trouble shooting on equipment and recognized the adapter.   The "Tube Extender" can be handy for checking voltages  while the tube is in the circuit.  I didn't have an extender for the 1625 so while I was working on a couple of ART-13s I cobbled one together. The small diameter PVC just fits over the 1625 base and covers up the exposed high voltage wiring and secures the tube socket to the base. The glue gun comes in handy. Note that the PVC from a "Sink Kit" has a nice flange on top. Sometimes it is called a Sink Expansion Tube.  The test point leads were made from the shield removed from RG-174 coax.
 Photo below.
Z
[cid:image001.gif at 01D72477.FA3B08C0]

On 3/25/2021 1:41 PM, J Mcvey wrote:
Looks likw you are making a "test socket" adapter with the wires hanging out like that on the top
On Thursday, March 25, 2021, 1:33:25 PM EDT, B. Smith <smithab11 at comcast.net><mailto:smithab11 at comcast.net> wrote:


[cid:image002.jpg at 01D72477.FA3B08C0]
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