09-06-2012, 03:58 PM
I usually pull the back, keep FAR away from high voltage bits and capacitors (or crowbar the power system after it's unplugged), and look for blown fuses and burn spots on the PC boards. A fast shutoff implies something wonky with the power section.. probably a capacitor that's leaking or blown.
Once you find the offending component (because it's leaking electrolyte, looks burned, etc..) then you're in the 'find a replacement part' zone, and also desolder / remove / replace / solder. Which gets real tricky.
Good luck !
I often wish we could still just take the bagful of tubes to the drug store and test them until we find the busted one, then go back and plug 'em all back into the chassis.
But then I recognize that we'd have to deal with static, vertical hold issue, and the dreaded Rabbit ear antennae.
Once you find the offending component (because it's leaking electrolyte, looks burned, etc..) then you're in the 'find a replacement part' zone, and also desolder / remove / replace / solder. Which gets real tricky.
Good luck !
I often wish we could still just take the bagful of tubes to the drug store and test them until we find the busted one, then go back and plug 'em all back into the chassis.
But then I recognize that we'd have to deal with static, vertical hold issue, and the dreaded Rabbit ear antennae.