[joebog1]

Thanks Lucien, I said this in post 3 or 4.

[QUOTE=joebog1;1518539]Sounds to me like its coupling back through your earth and negative of the power supply. I am assuming of course that they are common to the single transfomer and rectifier, audio amp, and power supply.

You could fix that by using a transfomer on the input of the audio amp. It will need to be primary and secondary NOT an auto transfomer.


Cheers

Joe