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Since this particular design injects video via the CRT's cathode, I wouid be disinclined to mess with the cathode circuitry at all. But rather concentrate on how to make the grid go negative at switch-off. A dedicated negative supply of maybe 16V or so, charging an electrolytic, would kick the grid negative thru a diode reversed-biased. Or sumpthin' similar or other, just musing.
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