Unless the speaker is bad, it sounds like you might be clipping. First, I would verify all the power supplies. Both the power amp supplies and the preamp supplies. One could be missing or the filter might have failed on one resulting in seriously reduced voltage and the addition of hum or distortion.
And certainly an op amp might have failed and is squeezing the signal over against one of the rails.
And certainly an op amp might have failed and is squeezing the signal over against one of the rails.
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