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Usually power supply electrolytics start off waving then as they warm up thermally they work. If the power supply electrolytics are failing after they have been on a while they start to run warm to the touch. Be careful, my RCA CTC-9 almost had it's power transformer burned up by a leaky electrolytic.
I would try subbing a horizontal oscillator tube as heater to cathode leakage can also produce the symptoms you are describing.
What signal sources are you using?
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