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Amplifier Transformer Hum

If you narrow the hum down to the amplifier's transformer, try to determine which circuit the amplifier is running off of. Then check the circuit breakers in the service panel.

Chances are that your amps' circuit is on the opposing phase of some or all of your other audio circuits and therefore generating some AC noise thats affecting the transformer.

Have an electrician move all of your audio circuit breakers in the service panel to the same phase of 115 volts.

Just for grins I moved my amp's circuit over to the opposing phase where my other dedicated audio circuits are to see what sonic improvements I may find. No sonic improvements that I could tell but it cured my transformer hum and the transformer has been almost dead silent every since.
stehno

Showing 1 response by stehno

stehno OP
1,453 posts
 
In my case, (I have many dimmers) all lights would be all the way off but would still get the transformer hum. Dimmers on or off made no difference.

Today, the only time I get a resemblance of the transformer hum I used to get is when the microwave oven is turned on.

Again, for some time now, I've been running 3 seperate/dedicated lines to each component but still had the transformer hum until I moved the amp's circuit over to the same phase as the cd player and preamp.
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