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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 20th Feb 2021, 8:57 pm   #1
Cobaltblue
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Default Polycon from Fegusson failed

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
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Old 23rd Feb 2021, 6:02 pm   #2
G6Tanuki
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Default 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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