[Milsurplus] Repair of small varible capacitors

[Al Klase]

Mike,

I did this a long time ago, so the details are a little vague.

The problem is that the hex adjusting collar has come loose from the 
capacitor shaft, and the contact spring pushes the plates together.

I made a jig involving a small C-clamp and a U-shaped spacer so I could 
reposition the cap plates against the contact spring and hold things in 
place, and still access the hex end of the shaft.

Then make sure the hex adjusting collar if pushed all the way down, and 
solder it to the shaft right in the middle.
(You can still adjust the cap with a 1/4" hex tool.)

Solder them all while you're in there!

Hope this helps,
AL


On 12/5/2024 9:13 AM, Mike Christie via Milsurplus wrote:
> Good Morning
> I'm in middle of restoring a BC 342 receiver. I 've done the fixed 
> capacitor replacements. I found I have a B+ short in the Second RF 
> module. After inspecting the inside of it I found several of the 
> varible capacitors plates were shorted. I suspect replacements would 
> be hard to find. I do have a BC312  hanger queen which has the same 
> exact module and will be installing it. My question to the group is, I 
> remember seeing an article on how to repair these varlible capacitors 
> but I don't recall where I saw it. Does anybody here know how to fix 
> these?  I think the fix was to drill a whole in the shaft and put a 
> pin in to keep the center plates from shorting to the fix plates.
> Thanks for your help
> Mike
>
> ______________________________________________________________
> Milsurplus mailing list
> Home:http://mailman.qth.net/mailman/listinfo/milsurplus
> Help:http://mailman.qth.net/mmfaq.htm
> Post:mailto:Milsurplus at mailman.qth.net
>
> This list hosted by:http://www.qsl.net
> Please help support this email list:http://www.qsl.net/donate.html

-- 
ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20241205/33b9723a/attachment-0001.html>