Working on the HRD which had the usual problems leaky caps, poor solder joints, power resistors overheating board.
Everything is working now on both channels but when I switch between clean and drive I get a loud pop.
With or without guitar plugged in and it doesn't matter what level volume is at.
I've googled and read many suggestions but no solutions. I've also read where this is normal for this amp.
Any suggestions would be helpful. Does your HRD do this?
thanks Ken