Is this a recent change or has it always run this hot?
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I'd contact Tony Pointes (sp?) at Parasound -- the bias may have drifted, so it might need to be re-biased; I had a similar problem with a Parasound amp, which was cured by re-biasing. If you're tech savvy and get the schematic for the 1500A from Tony, you could probably do it yourself pretty easily.