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Most of the time I have seen this kind of problem it has been dirty contacts in the tuner. In these tough cases it is not enough to just spray the contact cleaner in and turn the knob. You have to use a q-tip or lint free cloth saturated in contact cleaner (Deoxit, etc.), remove the tuner cover, and clean all the little buttons on the channel strips. The silver plating can get really tarnished over time.
Although, as Carmine said, a set will usually work after a fashion on old caps, I always replace all paper caps (usually used in pre-1963 sets) before trying to find a problem. Paper caps are unreliable and just continue to degrade, or can be thermally intermittent, making troubleshooting on such a set difficult. These caps can have enough leakage to short out and destroy resistors or coils.
Also, unless you have an old-time UHF convertor, a VCR will be necessary to actually get all of the TV channels (or any of them, in this particular case).
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