johnelstad wrote:
He shoots, he scores! My amp has a three-prong plug, so I added a
two-prong adapter and the hum disappeared completely. I'm so relieved.
Thanks so much, James, for your quick and helpful response!

John

James Lehman wrote:
Does you power amp have a two prong plug? If so try adding a wire from the
chassis to a real Earth ground. If your power amp has a three prong plug,
try it with one of those two prog adapters with no ground at all.

James. )


Be careful that you may have removed the safety ground connection, and
your power amp is grounded only through the audio cable screen to
another piece of grounded equipment. What you have proved is that the
hum is most likely coming from a ground loop. What you now need to do is
to find and eliminate the ground loop whilst still maintaining the
safety ground.

S.