Agree with colander
which power cord are you using?
Using any power isolaters? Power Conditioners? Etc
wall outlet ok? Using the same outlet for other uses that may interfere?
are the impedances b/w amp and preAmp a goood match?
etc etc
which power cord are you using?
Using any power isolaters? Power Conditioners? Etc
wall outlet ok? Using the same outlet for other uses that may interfere?
are the impedances b/w amp and preAmp a goood match?
etc etc