This is from the Sencore CR31A SuperMack manual, so I don't know if it works with all rejuvenators.
Quote:
If a CRT indicates absolutely no emission, and the filament is still working, an open cathode is indicated. When this occurs the automatic controlled REMOVE G1 SHORTS circuite of the CR31 can be used in an attempt to weld the cathode. (goes on to talk about resoldering the pins first).
1. Set the BEAM BUILDER function switch to the REJUV 2 position and allow the filament to warm up for 60 seconds.
2. Set the Function switch to the REMOVE G1 SHORTS position and IMMEDIATELY press the REJUVENATE OR RESTORE button before the filament has time to cool. At the same time, tap the neck of the CRT.
3. If a flash occurs in the CRT neck, release the REJUVENTATE OR RESTORE button. Return to the CRT TEST section and check the CRT for emission. If no flash occurs and/or no emission can be read on the meter, the cathode cannot be welded to restore performance.
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John