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Doorknob style capacitors rated between 40 kV and 175 kV or so are still available for use in medical equipment. They can be found on Mouser, etc. 40 kV, the lowest commonly available size, is overkill for all but the largest theater projection sets.
They're usually in the values we need (500-1500 pF) and the tolerances are no worse than the OEM part would have had when new.
They're rather pricey, running between $30 on the absolute low end and $100+ on the high end, depending on brand, voltage rating, and capacitance. Still, I'd rather spend $400 replacing leaky doorknobs than have a dark set with a bad flyback from the additional load placed on it.
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