I just installed a new Yamaha RX-673v receiver to replace a 22 year old Pioneer VSX-5500S. Today in my fairly small front room I noticed the familiar sound of a 60hz electrical hum. I turned off everything until I found it was coming from the new Yamaha receiver's case. I unplugged it and plugged the old Pioneer back in and heard the transformer humming in that one, too - except with more of an angry buzzing sound as well. Still, I had never really noticed the Pioneer's hum but the Yamaha seems to be catching my attention when the room is quiet.
Do all amps have this transformer hum or does this represent a serious flaw in the new receiver? I have to assume it's "normal" because the old Pioneer makes the same humming tone, but I wanted some other opinions since this is a brand new piece of equipment.
Do all amps have this transformer hum or does this represent a serious flaw in the new receiver? I have to assume it's "normal" because the old Pioneer makes the same humming tone, but I wanted some other opinions since this is a brand new piece of equipment.