Hi,
Before you decide your amp is defective, try these experiments:
1. turn both amps off. UNPLUG the amp that is not humming. Turn the "humming" amp on and see if it's still doing it. If not, then you need to "star ground."
2.
a. try switching interconnects at the amplifiers to see if the hum switches sides.
b. turn the humming unit off, remove the interconnect, turn it back on. If the hum is gone, the problem is not in the amp.
3. try phyically moving the amplifiers ( bad one to the position of the good one ) to see if the hum changes.
Best of luck,
Joe
Before you decide your amp is defective, try these experiments:
1. turn both amps off. UNPLUG the amp that is not humming. Turn the "humming" amp on and see if it's still doing it. If not, then you need to "star ground."
2.
a. try switching interconnects at the amplifiers to see if the hum switches sides.
b. turn the humming unit off, remove the interconnect, turn it back on. If the hum is gone, the problem is not in the amp.
3. try phyically moving the amplifiers ( bad one to the position of the good one ) to see if the hum changes.
Best of luck,
Joe