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Probably nothing. It's a series strung filament designed around 117 volts and you likely have 120+ at your outlets.
Back in the day they would short out a section of the big filament dropping resistor. If you have a shorted section, I'd remove the short if possible.
Regardless, the CRT filament isn;t going to cause the problem you have.
Looks to me like the yoke isn't pushed up tight against the CRT or there's an issue with the vertical output circuit.
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