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Help! My Adcom 555 amp and Adcom preamp is making a buzzing noise in one speaker - any ideas on troubleshooting - is it the preamp or amp?

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Try a different audio source.

Disconnect the cable at the preamp end from the amp and see if it stops.

If it does = preamp.

If not = cable or amp.

Reseat cables at both ends with a twisting motion.

Swap left to right.

There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.


Turn the volume to something reasonable and see if that helped.

Lots of ways to eliminate sources of the fault and isolate the problem.

Posted on Mar 12, 2011

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Things to check:
1. With your multi meter, measure from left ground to right ground. What do you get? Measure from each input ground to chassis. What do you get there.

2. Get or make a pair of shorting plugs. Plug those into the inputs. Power on. Hum there or gone?

3. Turn the pre-amp on. Connect. Level of hum change with preamp on?

4 additional information. How efficient are your speakers? This is a big amp, high-efficiency speakers may show some noise, while low-efficiency speakers won't.

A trip back to the shop may be indicated, too.

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