A few things. Did you connect the CRT day grounding to the chassis? In most sets there's either cabinet provisions to do that whe the chassis is bolted in or a separate wire....If the chassis is out and you don't run your own wire the CRT day ground can arc to the chassis and or yoke.
If your HV isn't too high (measure it to confirm) it could be your screens (G2) are too high...I've seen those set ridiculously high by previous owner morons before.
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