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I agree with wa2ise, replace all electrolytic and paper caps. A while back, I restored a 1953 Emerson. There was one paper cap that was hard to get to. As it only had 4 volts across it(in the AGC circuit), I left it in. Guess what the cap failed in very short order, causing picture and sync overload. I had to go back in and replace it.
A more recent experience was with a 1958 RCA portable. In this case, there were some capacitors that were packaged like the modern orange drops, so I assumed they were still ok. No! I had to replace these to get correct vertical linearity and height(which would shrink as the set warmed up). I am not sure if they were paper inside or just heat damaged. Now I just replace these as well!
40 to 50 year old caps are no good. The technology to make good, long lasting capacitors was just not available then. (I am not sure it is available now for electrolytics!).
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