Quote:
Originally Posted by rambo1152
has the seller given the mouthpiece a squirt of (electrically conductive) sanitiser that is causing the hum pickup?
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I don't know whether sanitisation was the cause of a microphone problem, but while I was poking around checking component values, one lead from the microphone came adrift - and I found that with this now out of circuit I got a nice clear dial tone with no buzz. Once I soldered the lead back in place, the buzz returned. This at least narrows the problem down to the microphone circuit, even if not necessarily the microphone itself.
Whether I can source a replacement microphone is, of course, another matter.