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Okay. I think I finally figured it out. Hopefully.
The HOT is very weak. I realized that it's barely conducting, and I'm having to compensate for the screen width and geometry by pushing the controls all to one side.
Testing it in circuit, the DC voltage of the HOT is 1.7V and it should be 108V. I didn't think that this could actually happen as I figured it would be completely dead if the HOT was so weak, but I guess this design it just acts as a boost or something rather than being the primary generation of the horizontal signal. It's weird that the geometry controls were actually capable of compensating for the size problem.
Going to get a new one, but it's a weird old package. 2SC1034. Not sure how long it will take to find a good replacement.
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