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Steve,
I was looking at the pictures you have on ETF of this set and spotted what to me looks like an old-stock molded wax paper capacitor in sweep chassis, that looks from your picture like a unit that historically was prone to moisture penetration due to poor seals on the leads. (It also could be a new type that I'm not familiar with.)
I can tell from your picture that it goes near or to the horizontal output, but can't see tell how it connects, however, the fattest condenser near that tube is C130, a .22 at 400 v, that filters stray damper hash out of the horizontal output screen voltage. This capacitor normally has 320 volts across it, plus whatever spike comes from the damper and centering circuit.
I think that a minor leakage in this capacitor would not cause the problem that you are having, unless it dropped the screen voltage, which you said was normal. It is a long shot, but it might be worth a test or a substitute.
James.
Last edited by earlyfilm; 10-18-2011 at 05:32 AM.
Reason: Replaced garbled screen capture
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