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Progress, no...but I have been working on it!
Thermistor completely removed, I also disconnected the degauss coil. Still doing it.
I did a test where I held up a piece of paper horizontally to the screen with a crosshatch pattern - vertically is really isn't moving hardly at all, it just looks like it is in the context of the whole picture. But with the paper there as a guide I can see it's pretty stable - it's maybe moving a little bit, but not nearly as much as horizontally. .
Horizontal, well, that's a different story. Voltages are weird on the oscillator, -4v on the grid vs -2, and plate is around 190v vs 165, though the waveforms look just like the pictures and frequencies are right. The curious thing is that if I put my scope probe on the grid of the H output, it immediately shuts down and the oscillator stops running. I'm not seeing any sign of the jitter in the waveform on the grid of the H osc, which is where my limited logic and experience tells me it would show itself. The frequency is stable and the waveform itself is completely solid.
I'm guessing (and it is a guess at this point) that the H osc shutting down when I probe it might be a clue.
ETA: High Voltage is correct and doesn't vary at all, from what I can see on the probe's tiny meter.
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