From: @noway.com   
      
   Mark Zacharias wrote:   
   > "Jack" <@noway.com> wrote in message news:jtnp3c$dcf$1@dont-email.me...   
   >> Jack wrote:   
   >>> After a week of playing with no problems, the right channel went out. It   
   >>> was the left channel previously. I was dismayed until I remembered that,   
   >>> when I reseated the output trannies, I switch them, left for right. I   
   >>> was further heartened when that same trick of switching off the speakers   
   >>> and turning the volume up to max brought the sound back. Since there are   
   >>> a pair of outputs in each channel, switching one of them again and   
   >>> waiting to see which channel goes out next should tell me which tranny   
   >>> is bad.   
   >> After switching back one pair of the output transistors, the PNP's, NEC   
   >> B539A's, the problem stayed in the right channel, so I replaced the   
   >> right channel NPN, an NEC D287A with an NTE284. It's playing fine at the   
   >> moment. I will button it up and consider it fixed until it tells me it   
   >> isn't.   
   >>   
   >> Jack   
   >   
   >   
   > If you have not cleaned the relay contacts yet - you are wasting your time.   
   >   
   > Mark Z.   
      
   I cleaned the relays a couple of years ago when I tried to tackle this   
   the first time. Buffed the contacts with 1200 grit wet/dry sandpaper.   
   This time I tested the relays by bridging them when the bad channel was   
   out. didn't help. It wasn't the relay. The problem followed the NPN   
   output transistor when a swapped them left to right and right to left.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)