Amplifier Hum

I had amp humm and initially thought it was the amp. Turns out, Toroidal (sp??) transformers are prone to this as a result of electrical interference. In my case, it was a halogen lamp on the same circuit as the amp. Turned off the lamp, away went the humm.

My current amps do humm slightly due to design, not a big deal though.

Regards,

Even number of grounds? Dimmer switch on the same circuit?

Try using a "cheater plug" on the amp (converts from
three-prong to two-prong). Often a hum is due to
a ground loop and floating the ground will eliminate
the hum.

I too had a hum problem. T began by turning off my source components, still a hum, then my preamp still a hum. Tried a diffeent amp, still a hum. Changed out the cables from the amp to preamp hum was gone.
Though sometimes the hum might be just because it doesn't know the lyrics. :)

Check the A/c plug on the back of our amp...if there's a 3rd prong on the unit, that is more than likely the cause of your problem. The extra conector will generate a 60 hz cyle humm which may be coming through you cable TV...try disconnecting your cable vision and see if the problem does away. I had the same problem and the culprit was my cable which was not properly grounded. Unfortunately, the only workaround was to buy a cheater plug (which as I understand can be a fire hazard), OR purchase a Jenson transformer ground loop isolater. I picked one up off Ebay a few months ago for 50 dollars and the problem was solved immediately. Here is the part # VRD-1FF and here is the website to lern more about the product http://www.jensen-transformers.com/

Good luck