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Philips210 · 4th Aug 2018, 10:42 pm

Hi

I seem to recall a problem with a carbon track potentiometer that suffered from a low resistance path from the track to the body of the pot. A replacement cured the fault but I didn't investigate the actual problem with the faulty pot. In hindsight, this could well have been due to tin whisker growth. The pot did look a little corroded and had a whitish appearance to the body. It had probably been in a high humidity environment.

Regards
Symon.

4th Aug 2018, 10:42 pm	#13
Philips210 Nonode Join Date: May 2007 Location: Redruth, Cornwall, UK. Posts: 2,573	Re: Roberts R707 Hi I seem to recall a problem with a carbon track potentiometer that suffered from a low resistance path from the track to the body of the pot. A replacement cured the fault but I didn't investigate the actual problem with the faulty pot. In hindsight, this could well have been due to tin whisker growth. The pot did look a little corroded and had a whitish appearance to the body. It had probably been in a high humidity environment. Regards Symon.