Re: Need experts for vexing hum problem

On Fri, 29 Feb 2008 23:28:49 GMT, Rich Grise <rich@xxxxxxxxxxx> wrote:

On Fri, 29 Feb 2008 10:10:49 -0800, tomg wrote:

But none of that would explain why it also causes hum when it is not
even powered on.

Your preamp has a loose ground on its output, and is acting like an
antenna.


Yes, it really sounds like a lousy patch cord with an open ground on
one end. - the extreme case of 'ground loop'.

RL
.

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