Originally Posted by
subwoof
I think that was me - am in new york.
if the fan goes on too soon the 20K 1% resistor ( light green ) on the main board is way outta whack - replace it with any resistor (tolerance) as long as it reads very close to 20K.
betcha that when you cleaned it you *disturbed* the low voltage trim pots on the power supply board...
install NEW LV caps - esp if those are 30 years old...! get 105C if possible.
Remove all 4 main output cards ( label them first! ), use a real good pot cleaner and douse the trim pots then rotate them through most of their rotation a dozen times or so.
Fire the amp up and set them to +/- 15V and make sure the +20v is there.
Then re-install the output cards and see what happens.
sub