[Milsurplus] Repair of small varible capacitors

[jphutch60bj]

Boy oh Boy A picture would be worth a 1000 words in this case.

The contact spring is that the 2 or 3 pronged  metal piece around the  
rotor blade shaft?

  1.  U-shaped spacer

     A.  Spacer Material ?

     B.  Thickness to split the difference between the plates I would 
assume?

2. Solder where in the middle and how much?

On 12/5/2024 9:28 AM, Al Klase wrote:
> 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/
>
> ______________________________________________________________
> 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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20241205/28dbf074/attachment-0001.html>