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Ran a couple tests tonight. Need to slide the board out a bit to access the resistor for the 8BU11, so I'll plan to do that this weekend when I have more time.
I think I'm getting closer. I tested the boost voltage off of pin 3 on the flyback and the boost point on the height control. I can get 670V on the flyback (it was around 620 when I first tested, but I was able to get it up to 670 by turning the horizontal control) but the pin labeled "boost" on the height control is stuck around 250V. Again, this is all in DC.
So what's in between those two points? Is it just that capacitor? I think I know what you're talking about, and I actually replaced it already. Perhaps it got damaged when I miswired things earlier? I can see about ordering a replacement. Or maybe it's a different cap than the one I'm thinking of.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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