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I said electrostatic focus - not deflection.
Sure, you can use a 12LP4 if you:
* Modify the filament voltage from 2.5 to 6.3
* Swap out the HV connector
* Hack up the metal funnel to handle the shorter CRT
* Possibly swap out the yoke because of the steeper deflection angle
* Somehow add magnetic focus and disable the high voltage focus supply
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