[Milsurplus] Looking for part for PP-4763

[Glenn Little WB4UIV]

Can you remove the RFI filter and use heat to unsolder the lid?
This assumes that the RFI filter is in a metal can with  the lid 
soldered on.
If you can get inside the RFI filter, you will probably find shorted 
capacitors or a coil welded to the case from an EMP event.
 From here you might be able to fix it.

73
Glenn
WB4UIV


On 10/25/2020 11:32 AM, Jack Antonio wrote:
> One thing leads to another. A seemingly simple
> project turns out differently.
>
> I needed to replace the plug on the power cord
> for this supply, and in the process found the
> neutral shorted to ground.
>
> Turns out the RFI filter (A6Z3) is the culprit.
> Both neutral and hot lines are shorted to ground,
> but a previous owner had rewired the  hot side to
> bypass.
>
> So, anyone have a parts unit PP-4763 that can
> give up its RFI filter? Only part numbers I
> can come up with are GF-7390-1(which apparently
> is also a part number for a Caterpillar tractor,
> according to DuckDuckGo) and SM-D-633343, which
> I think is a Signal Corps drawing number.
>
> This is a large rectangular can mounted on
> the back panel, and is the RFI filter for
> both the AC line, and DC output.
>
> Then in the process I discovered a blown up
> resistor in the crowbar, so the crowbar has
> been nonfunctional.
>
> Power supply works, and has been in my
> shop for over 20 years (a gift from
> Buzz Mueller, another SK fondly remembered).
> Never noticed any problems from the lack of
> an RFI filter, but would like to restore this
> back to stock if I can.
>
> Thanks
>
> Jack Antonio
> WA7DIA
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI LM   NRA LM   SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"