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   alt.electronics      Electronics design, repair, worship, etc      7,706 messages   

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   Message 5,998 of 7,706   
   Mark & Mary Ann Weiss to All   
   Re: Very Odd Audio Common Mode Condition   
   02 Jan 08 04:56:13   
   
   From: mweissX294@earthlink.net   
      
   Almost 24 hours TO THE MINUTE since this problem mysteriously appeared, it   
   vanished!   
      
   I had pulled the amp from the rack 20 minutes ago, leaving slack on the   
   wiring enough to set it on a crate in front of the rack. I powered it up and   
   it worked normally.   
      
   So the next thing I do is take an alligator lead and cautiously touch the   
   amp chassis with one end and the rack with the other, fully expecting   
   fireworks. Not a thing happened.   
      
   So the next thing I do is carefully lift the entire amp and sssllooooowwlly   
   slide it into the rack space where it normally sits. Again, NOTHING unusual   
   happens. So now I'm really wondering... The next thing I do is put one screw   
   in. Still no fireworks. I put the rest of the screws in. It's still working!   
      
   Next test: I power off the amp and power it back on. Still works.   
      
   Now let's try the other surround source (at this point I have it working   
   with the front end mixer output, something it would not do for the last 20   
   hours.) I swap the input connections with the output of the DVD player's   
   surround outputs. I power the amp up and... no popping. Just surround   
   program coming out of both channels as it should.   
      
      
   The bottom line is, this goes down in my "X-Files" folder. It's something I   
   cannot explain. For exactly 24 hours, no matter what I did, I could not   
   solve the "feedback loop" or whatever phenomenon was occuring. Now it's   
   working and all I did was install the amp while it was powered on. The other   
   7 or 8 times I installed it in the last 24 hours it was powered off. Go   
   figure. I'm not a mystical man, but this occurance is deeply disturbing   
   because I have not found the cause of the problem, and it cleared up just as   
   quickly and mysteriously as it appeared last night.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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