Humming Noise


I have a pair of Don Cochran mono amps. One of them is causing the humming noise to speaker (B&W 801/3). I think one of the caps is leaking but not sure. How do I fix it? Don was out of business. Where do I send the unit for service? I have manual user and schematic. Please help. Thanks so lot in advance.
oanhu

Showing 1 response by joeabrams

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