Counterpoint SA-3000 Preamplifer


My preamplifier now has a his that I don't know where it's coming from.  Does anyone know what might cause this issue.  
Also does the tubes need to be biased? if so, does anyone know how to do it?

Thanks
chan-audio

Showing 1 response by teo_audio

if it is in both channels, it is power supply related... if it is in one channel it’s a tube, resistor, or capacitor.