When I put a line conditioner in my system, the crackling noise stopped. A multimeter line check showed that the voltage was going from 118 to 140 volts within seconds that summer.
The Tripp lite line conditioner LC1200 solved this problem relatively inexpensively. This is definitely not audiophile-grade equipment, but in this case it worked without having to deal with tube diagnosis issues.
The Tripp lite line conditioner LC1200 solved this problem relatively inexpensively. This is definitely not audiophile-grade equipment, but in this case it worked without having to deal with tube diagnosis issues.