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If you get a B&K, get a 467, 470, 480, or 490. The models below 467 have a very primitive rejuvenate function and you'll likely blow up your CRT. Also, adapters for most tubes are fairly easy to come by for the newer B&K models. I think the 445 dates from the '50's and is for B&W tubes only. The first CRT checker I owned was a B&K 465 from the '60's and I NEVER had any luck rejuvenating a color tube with it. Blew up plenty, though. It worked on some of the B&W tubes. My current model is a B&K 480 from the '90's and I've rejuvenated countless tubes with it. You should be able to pick up one of these fairly cheap on ebay. I'm sure they will get cheaper as time goes on due to the phasing out of CRT's.
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