Question about Sunfire 300 Two Amplifier

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Suddenly my Sunfire 300 x 2 started to HUM, need a Scematic Manual or advice on which parts to be tested

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Sunfire Amplifier hum

If it works fine with other inputs then it simply cannot be your sunfire. Next time it happens try reversing the power plug on one of the pieces of equipment hooked up to it and see what happens.

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