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I agree about the 465. 20+ years ago, my first CRT tester was a 465 that was given to me by a repair shop who no longer used it. It was fine for testing; but, wasn't as fine for rejuvenating. I was able to bring quite a few standard B&W tubes back to life by popping them on the lowest setting (which, is still harsh); but, I also blew up quite a few tubes in an attempt to rejuvenate them. Within a few years, I bought a B&K 470 and I don't recall ever smoking a tube with it's rejuvenate function. I've had some CRT's that were simply too worn out to rejuvenate; but, I don't recall one ever being ruined.
Once, I loaned my 465 to someone who wanted to rejuvenate a color tube. Despite my warning, he thought that starting out on the highest setting would do the best good. Well, it did the best good at ruining his tube. Those models have three levels of rejuvenation for a reason and one is supposed to try the lowest setting first. If that works, don't go any further.
The B&K 467 and later model numbered units have safe rejuvenate functions, as does the Sencore CR70 and newer units.
When I rejuvenate a tube with my 470, I always start with the "clean and balance" function. This is a lower level of rejuvenation and is often all that's needed to bring a tube back.
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