That amplifier had a transformer that can be noisy. Try plugging the amp directly into the power outlet. Ground loops will be heard in the speakers, not the chassis. I have the same amplifier, when I had it one my test bench plugged into an outlet strip, it was very loud for the first few minutes. Definitely transformer hum. When I installed it into my theater system and plugged it into a Monster HTS 3500, the hum went away.
Are your grounds to BARE metal sounds like a ground loop issue.
Only have a couple of items hooked up right now and none of them have a place for a seperate ground wire. The are all plugged into a Furman power conditioner. It makes the same noise even it is the only thing plugged in and nothing is connected to it. I know the house power is well ground but I know our main transformer that the power company supplies does make a simliar noise. If it is a ground loop issue how would you fix the problem? Thanks again Brad
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SOURCE: Adcom GFA 5500 'mechanical' hum from amplifier
Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.
Register and download the sparse manual for free at retrevo.com
http://www.retrevo.com/support/Adcom-GFA-545-Amps-manual/id/582ci563/t/2/
Pictures:
http://www.audiocostruzioni.com/r_s/ampli/amplificatori-2/Adcom%20GFA%20545/adcom-GFA-545.htm
It has two clearly labeled inputs and TWO corresponding speaker outputs.
(Wincing) in-line volume controls???? For casual listening? Say it ain
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more information the cycle is about 1 second from peak to peak and the sound seems to be comming from the front center of the unit. Have not taken it apart yet was hoping maybe someone had idea of what the problem may be. Thanks brad
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