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-   -   Polycon from Fegusson failed (https://www.vintage-radio.net/forum/showthread.php?t=176874)

Cobaltblue 20th Feb 2021 8:57 pm

Polycon from Fegusson failed
 
2 Attachment(s)
I put in a request for a replacement which was thankfully responded to by Bill (AC/HL).

I have now replaced the offending Polycon cap and have signs of life although a little way to go as there is the usual AF11*,s and to add insult to injury a bunch of Callins caps.

Going to be a day or two before I can get back to it.

I though I would share pictures of the failed capacitor.

Its been a while since I have had to replace a Polycon so I suspect failures of this type are not that common.

Cheers

Mike T

G6Tanuki 23rd Feb 2021 6:02 pm

Re: Polycon from Fegusson failed
 
I've seen that sort of failure where someone has given a Polyvaricon 'a good squirt of switch-cleaner' then twiddled it.

The surface-tension of any liquid introduced between the plates and the interleaved dielectric-laminations can make them cling-together enough to tear the dielectric-sheets from their mountings.


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