Hi Bongeiste,
I just had this problem. One of your source devices (CD player, turntable, or tuner) has a 60 cycle hum on its audio outputs. Disconnect one source component at a time until the hum disappears. Then take the source component in for repair.
I just had this problem. One of your source devices (CD player, turntable, or tuner) has a 60 cycle hum on its audio outputs. Disconnect one source component at a time until the hum disappears. Then take the source component in for repair.