[QUOTE=joebog1;1519095]Thanks Lucien, I said this in post 3 or 4.
Quote:
Originally Posted by joebog1
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
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Hi Joe..I tried an old audio input transformer, similar to an LT700, with isolated primary and secondary windings, but that did not get rid of the issue. I fed the audio signal to the primary and connected the secondary to the amplifier's signal input and ground.