Re: 60Hz hums...
Quote:
Originally posted by JoeBob
Usually I love a hummer, but this is just annoying...
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 He he he.
JoeBob, I'm curious why there is a difference between your first and second preamps. If the wiring is absolutely identical, there must be a bad connection somewhere in the second. If they're not quite wired identically, what is the difference? Could you have something like a phono jack accidentally grounding to the chassis or something like that?
It really does sound like a ground loop with the experimental results you've posted. Hang in there, you'll get it solved.
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