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Very good post. I restored an Emerson from about 1954 and neglected to re-place an AGC filter cap(paper/wax) with all of 4 volts on it. Needless to say, the set had AGC problems as it warmed up, too much gain with picture overload and loss of sync.
Replacing this last capacitor fixed the problem. As mentioned, always replace all old electrolytic and paper caps. Many problems can be solved or prevented by doing this. Testing them and hoping they stay good(if they happen to test good) is just not worth the headaches.
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