[Collins] Strange fix for a common problem

[Glen Zook]

I just got finished working on a 32S-1 for a client.  Among other things it was very microphonic.  Often the source of this is one, or more, tubes especially in the audio section.  However, replacing the tubes did actually nothing to correct the situation.

What I eventually found was that one of germanium diodes in the balanced modulator was microphonic.  Now this was one of the later 32S-1 transmitters which had the 4-diode balanced modulator rather than the 2-diodes that were present in the earlier versions.

Replaced all 4 diodes and no more microphonics!

Glen, K9STH

Website:  http://k9sth.com