UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits


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.

Closed Thread
Thread Tools
Old 20th Feb 2021, 8:57 pm   #1
Cobaltblue's Avatar
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,035
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.


Mike T
Attached Thumbnails
Click image for larger version

Name:	Poly 1.jpg
Views:	109
Size:	47.2 KB
ID:	227237   Click image for larger version

Name:	Poly 2.jpg
Views:	99
Size:	51.1 KB
ID:	227238  
Don't care if it was a bargain why's it in my kitchen
Mike T BVWS member.
Cobaltblue is online now  
Old 23rd Feb 2021, 6:02 pm   #2
G6Tanuki's Avatar
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 11,868
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.
G6Tanuki is online now  
Closed Thread

Thread Tools

All times are GMT. The time now is 3:10 pm.

All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at
Failure to heed this warning may result in death or serious injury to yourself and/or others.

Powered by vBulletin®
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Copyright ©2002 - 2021, Paul Stenning.