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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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