This is the 3rd new unit I have tried. They all do this in my home but not
the store. thanks.

wrote in message
oups.com...
new:
I really doubt your conclusion is correct about "dirty power" .....
check and tighten the pcb grounding screws that hold the boards to the
chassis and the screws on the back panel that hold the rca phono
connectors.
electricitym
.
.