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Alesis RA500 amp - channels crackle, distort, cut out

I have a 15-month old Alesis RA500 amp with a problem - for a few months now, often the left channel would be "crackly" and cut out, but then seem to "warm up" and be fine.  Now, the right channel started to behave like that, even after it had been on for a few hours: it would get crackly and distorted (esp. if fed low-frequency content, like bass guitar) and then cut out entirely.  There's no problem with load; I'm using 6 ohm Polk Audio Model 11 studio monitors (circa 1982 and still some of the best speakers I've ever heard, IMHO).  Note that these behaviors have nothing to do with volume, either - I typically run the amp's controls between 9 and 12 o'clock.
The amp is only about 15 mos old, so I wouldn't think caps are going yet from age, unless they were crappy to start with.
Thoughts?

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  • zahzah Jul 21, 2008

    My RA500 is a few years old, now. It's always had that crackling problem from time to time, exactly as previously described under the same circumstances. Except, when it became too irritablle, I would "exercise" the speaker output jacks, jacking them in/out a few times, believing ther to be a dirty jack. BUT NOW, it's developed a constant loud "ground hum" with no input signal AND volume knobs turned down to zero ! Hum is present on any AC circuit I try.

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  • Master
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You have a problem in output stage and output ic need to check or replace.

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