Obviously, you've been with us on this BBS a long time and therefore have heard (and most likely participated in) all of our discussions about ground loops, which is what you sound like you've got. So there's no sense in hashing over that stuff again.

But something that I remember from another discussion that might apply in your case: Someone here reported that a loose wire on his connector (in his case, internal to the empeg) caused noise problems. Can you verify if this is the problem or not?

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Tony Fabris