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Speakin' of replacing caps, the very first ones that should be replaced are the coupling caps going to the control grid (G1) of the H output tube, Vert.output tube, and audio output tube (in that order). Any leakage in a coupling cap will push the grid more positive, making the tube overconduct.. which is bad news in a power tube.
Once the power tubes are happy, then go ahead with the rest of the caps, powering the set up after each replacement to watch improvements. I would resume with the coupling cap going to G1 of the video output tube.
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