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Blooming with brightness turned up is due to HV failure as CRT beam current lugs down the HV supply. Have you verified visually that the 1B3 filament is glowing (as suggested previously)? If it's not glowing, it hasn't got enough emission to sustain the HV under load.
(EDIT) If it's not glowing, I would temporarily jumper that 2.7 ohm resistor and see if the filament glows.
Last edited by old_coot88; 04-29-2020 at 07:16 PM.
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