[reeferman]

I worked on a TON of these back in the day.
First things first. Do a visual and check for the obvious; poke around and look for overheated components, wires, etc. Go under the chassis in the power supply section. If the set has any time on it you will find corroded solder joints, bad/ ready to fail solder terminals, resistors, etc. Those power resistors generated a LOT of heat. It’s best to remove the power resistors from the terminal strip, sand the leads clean and clean the terminal strip lugs. If you’re lucky you’ll succeed. If not, replace. Replace or re-stuff the canned electrolytics. If they are the originals they can (no pun intended) go at any time. As previously mentioned, re-solder every circuit board’s ground lugs. Without a good power supply you have nothing.


Also, have you checked the tubes?

Once sure the basics are present, you can tackle the rest.