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The problem described is in the vertical sweep circuit, not video, IF or tuner. I would suggest changing only the molded caps on the RF chassis, not the ceramics now. The RF plate limiting resistor is the most frequent tuner trouble. It will not cause your symptoms.
Make sure all the voltages are correct in the vertical circuit. Height, hold and lin controls are a place to start and, of course, the two tubes. Check coupling cap from vertical oscillator to output and discharge cap from vertical oscillator plate.
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