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I think I've got it. I replaced both the vertical osc and output tubes and was then able to adjust the controls to get a stable pic.
It just passed a 30 min bench test. The only thing I noticed was a white horiz line towards the upper part of the screen. You can see it going across the man on the left's head, above his left ear. I think I got most of it eliminated by tweeking the vertical lin control.
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