Modern TV sets either run the CRT heater from its low voltage DC supply (that also runs the tuner, IF, and such) or powers it with a few turns of wire wrapped around the flyback transforemr core, like they used to do to get filament power for the high voltage rectifer tube (like a 1B3). So a modern TV set won't likely have anything usable for this. Other parts like capacitors in solid state TVs and computer monitors I found can be used for recapping various high voltage tube circuits.
Be careful when picking a place for the heater transformer that the transformer's magnetic field doesn't leak into the CRT causing beat patterns of deflection.
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