From: @noway.com   
      
   Dave Platt wrote:   
   > In article , Jack  <@noway.com> 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.   
   >   
   I just bridged the left channel contacts on the relay and got nothing,   
   so the problem appears not to be with the relay itself. There is a   
   circuit on the schematics called the "Protection Circuit Assembly", the   
   sole purpose of which appears to me to be to activate the relay. Seeing   
   as how the relay activates I don't see that as being the source of the   
   proble so I will proceed to the left channel of the main amp section.   
      
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