Originally Posted by
walpurgis
Is the signal neg common with the amp chassis/case? It could be worth running a wire between the metal casework of the power amp to the case of the pre-amp to see what happens. It may go quiet, get worse or do nothing.
Yeah that would have been my next suggestion. Looks like he has it sorted though.
“Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”
Hunter S Thompson