If I'm understanding you correctly, you recapped the doorknobs?
I've never seen one fail, but to each their own I guess.
One of your diode couplers likely isn't working, or the filament windings have shorted to ground. Did you restring them yet? I always do, wiring doesn't last forever...
If that's not it, I bet one of your new doorknobs went bad. Measure the voltage at each point in the doubler circuit, you'll probably find a loss somewhere.
I have a bunch of doorknobs ere if you need.
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