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I've rejuvenated CRT's that held up for years and others didn't last a week. It all depends on the overall condition of the cathode and how decent the tester is. With my B&K 470 tester, I can generally judge rather or not the procedure will hold up based on the meter pointer action. When rejuvenating a tube, one is to hold down the button, at which time the pointer will rise up the scale. When the pointer drops back down, release the button. When the pointer swings up and stays up a long time before dropping, the process will probably last awhile. If the pointer moves up and quickly falls back down, moves up very little, or does not move up at all; then, the process either did no good or will not last long.
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