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Well, it seems the CRT is not the main problem.
I did not have any arcing last night and it ran for about 30 min at 7-15KV with raster. The HV reg tube is supposed to have 400V on the cathode and 350V on the grid according to the sam's. I've got 311V and ~135V respectively.
One odd thing is that the raster is huge compared to normal (both Horiz and Vert have excessive overscan). Normally before it started acting up the vertical was nearly under-scanning and horizontal over-scan was mild (the picture would be huge/dim like this for a moment late in warmup).
I'm going to have a look at the boost voltage tonight and see how that is doing.
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