Question about Adcom GFA-5802 2-Channel Amplifier

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Adcom GFA 5500 'mechanical' hum from amplifier

Adcom GFA 5500 'mechanical' hum from amp. Comes and goes. 60Hz, does not affect sound from speakers. Thought it might be the transformer but toroids have nothing to rattle. Capacitors?

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When power transformer is stres it gave that hum . check if you have some big power consume even with no loud. if yes might be capacitor. but my opinion that is not the transformer is the problem it need a bath with enamel

Posted on Jun 25, 2015

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Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.

Posted on May 11, 2010

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Is a Adcom GFA-7500 5 channel power amplifier bridgable?


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Feb 23, 2011 | Adcom GFA-7500 5-Channel Amplifier

1 Answer

When turning on you hear thumping sound from speakers turning off aswell i am using very efficient speakers


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Adcom gfa 555 blows the 10 amp fuse and the 6 amp fuse on the far right


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1 Answer

Adcom 7500, Adcom 5400(bi-amp), Marantz AV-9000, Dakiom HA103


Try just the power amp on ..nothing connected
no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop.
If there's hum with just the Adcom..then it's the ADCOM

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