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I think this would be a good time for the scope...when you have verified DC voltage measurements you need to check that the AC signals are OK. I would check and make sure there are sync pulses going into the horiz. section. The output tube should not have an effect on sync.
If this is the 4 tube model I have seen effect of bad electrolytics in several of these so it would probably be good to check ESR on the power supply filter caps or just replace them.
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