Open filament in CRT

Marvin Moss

Does anyone have reference material or procedures to weld an open filament on a CRT?
I understand that with the judicious use of a large capacitor and a high voltage, it is possible to weld a filament break.
Nothing to lose in trying it but I do not know the amount of high voltage or capacity of the cap or the procedure to use in trying this stunt.....
It was used back in the old times on hard to find tubes and I have heard that it sometimes works.
Can you help me find a reference here?

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