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Shorting the screen grid resistor brings the screen up to the supply voltage, well above what the schematic shows as proper. Cathode voltage comes close to what it should be (17 vs 18 v relative to the the -135v buss).
Every part in the damper and boost sections has been changed. As you can see, there is very little connected to the boost (hor. osc and CRT screen grid pots). All those components have been checked too.
I see no other possibility other than the flyback.
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