In article , Jack wrote:
Given the behavior described above I can only guess that a rise in
voltage in the main amp produced by turning up the volume with the
speakers turned off somehow corrects the condition causing this problem,
but at the moment I don't know what this condition might be.
One thing to suspect in cases like this, is a bad electrolytic
coupling capacitor between one stage and the next.
Bad output-protection relays can also cause this sort of "turn it up
far enough and it starts working" problem.
Usual next step is to use a signal tracer / oscilloscope, and see how
far through the output circuitry you can detect audio when it's in the
"not working" condition.
--
Dave Platt AE6EO
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