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If you want to get specific about your TV you need to post a schematic that shows at least the circuit around the CRT base.
I have seen designs that use a dual contacts power switch where the extra contacts connects to a circuit that changes the CRT bias to turn off the gun as soon as the power switch is turned off.
Assuming your set does not have a circuit that turns the gun off, one could be added.
It could be that your set does have a circuit to do this but a capacitor or resistor has changed value.
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