Any GG3 owners? Does yours have an internal hum when turned on? Mine does when a recti is inserted and can be heard from the listening position 7-8' away. It doesn't vary with the VC, so I assume it's 120 Hz. I'm trying to figure out if this is the nature of the beast, a defective cap or something, or a ground loop. To check, I disconnected the ICs and with an extension cord plugged it into a distant outlet, but the full internal hum was still there. That suggests either the condo has a ground loop or it's the dac.