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I agree about the rejuvenation. My first CRT tester, back around '91, was a blue B&K 465 from the late '60's that was given to me by a TV shop who no longer used it. Back then, most of the TV's that I was working on were either B&W or delta gun color and the 465 did a good job of checking those tubes; however, it's rejuvenate function was the same as yours. I used it very carefully to rejuvenate some of the older big neck B&W CRT's; but, I never went higher than the lowest setting. Even doing it that way, I still torched a number of CRT's. I don't think I ever successfully rejuvenated a color tube with it and I learned to never attempt rejuvenation of the newer small neck 9"/12" B&W CRT's. It wasn't long before I invested in a newer B&K 470 that would test virtually any tube and had a much safer rejuvenation feature.
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