This amp work great after replacing both the big blue main filter capacitors ( the multi-cap inside the aluminum can had been updated before) and at this time of removing the cover I replaced the signal path cap ( red and gold) on the input board too. inside the unit I add the blue pilot lights before because I want to see when the unit has the power on or not ( no power switch on this amp). This unit will include the service information paper for your reference if you want to enjoy the restoration project, I'm done with it because I'm getting old and this amp is very heavy.