On 10/4/2016 22:18, John Freed wrote:
I disconnect the power cord from the amplifier at the amplifier and the noise
remains.
Do you mean there's just a power cord plugged into the outlet, and the
other end connected to nothing? If that's the case, I'd suspect arcing
at the plug at one end of the cord, in which case you should replace
that cord immediately, before it starts a fire. The only other
possibility I can think of is that the wiring to the wall socket is in
conduit, so it's shielded, and the line cord is acting as an antenna,
radiating whatever junk is on the wiring. (Be sure to turn off all the
fluorescent lights nearby.)
73,
Scott K9MA
--
Scott K9MA
[email protected]
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