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 chan-audio

Thank you all for your suggestions.
I've hired a electronics' repair company to evaluate my SA-3000.  I'll let you know of his findings.