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OK.
Well the doorknob might be bad, it happens. They are a little tough to find so it would be good to find the problem was somewhere else.
It could be the HV rectifier. The filament glow is hard to see.
Do you know if the horizontal frequency is right?
Did you measure what voltages that you can around the horizontal sweep circuit?
If you have a compact fluorescent bulb?
If you hold one near the horizontal output tube or flyback it should glow.
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