912 Audio HUM Problem

[Mark_AR]

Has anyone else had a problem with the 921 and a bad 60hz audio hum? It is present whether the 921 is on or off.

None of my other components exibit this.

The only way it goes away is to unplug the 921 from AC or disconnect the audio jacks.

I don't mean the FAN noise either. This sounds like an open filter cap in an amplifier circuit, but is only in the 921, not my amp. Hmmmm...

 

[BarryO]

'sounds like a ground loop to me.

what, exactly, is connected to the 921, on all its ports?

I use the optical audio output from my satellite receiver; one less thing to worry about.