Classe Amp buzzing/humming...any ideas??


I have a Classe CA-151 150X2 amp that has a buzzing/humming sort of sound coming from the unit itself, not the speakers!! It is low noise level (can't be heard across the room) and it comes and goes and usually only last for 1 to 2 seconds. My dealer said it was the power coming thru the wall that had a dip or polarity shift.
Classe said it could be Electromagnetic resonance from the power supply. Anybody have any ideas and/or suggestions?
Sound is wonderful, it does not seem to affect the sound.
Thanks for your input!!
128x128jmphotography

Showing 1 response by jmphotography

After the recommendation of Classe, I opened the unit and checked the bolt holding the toroidal trans. and it took about 1 1/2 turns. The problem seems to be reduced. Oh, Glen...there were no birds inside, but thanks for your help! Has anybody ever trie the AH! A/C offset killer?