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I used a 470 back in the 70's and it worked pretty well, I believe it has a "Clean" function as well as Rejuvenation.
The Beltron in the one most people here recommend for doing a "Cleaning" on the CRT guns, never used one myself.
They can be found pretty cheap on eBay now and then, the 470 B&K seems to go for quite a lot still.
My opinion on cleaning or rejuvenating is it's not a permanent fix.
On an old B&W set that you will use a few hours a year to demonstrate it might be good enough to get by but one something you want to use for a daily watcher it may not last six months. When the cathode is gone it's gone and nothing will bring it back short of a rebuild. A Color tube just multiplys the problem x3.
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