Quote from: teemuk on August 21, 2007, 04:47:25 AMThanks for the reply. The optocoupler has already been swapped in this amp. I rechecked the voltage to be sure and it is still at 28VDC. I'll go ahead and put an LM3875 in it and see what happens.
Supply voltages are definitely past the max ratings of the concerned TDA chip. Reputedly that amp will also suffer from problems with the optocoupler.