I sold Audio Research stuff for 30 yrs. Never had an underlying problem as you are describing.
One thing that comes to mind is to measure the voltage coming out of your socket receptacle the unit is plugged into.
See if it is truly 120 or something different.
One thing that comes to mind is to measure the voltage coming out of your socket receptacle the unit is plugged into.
See if it is truly 120 or something different.