100% no good on anything with inline guns, including all Sony. The early 70s RCA one-gun 17" tubes did seem to respond better though.
I too have been very disappointed with soft-looking Sylvania replacement CRTs which won't wake up, I expected much more from them.
Recently, I repaired a Beltron and those are easier on rejuvenation than most. I have been my Heathkit IT-5230 for 45 years, which is very similar to a Beltron but with improvements. The rej/cln uses AC to remove polarized cathode glaze, the DC is for rejuvenating.
The first one I used was at VoTech shop in 10th grade. They had a Heathkit that I used on an RCA CTC16XL that had completely lost red. The results were so impressive, I bought and built one.
I later worked at four different TV shops and none believed in using one for these valid reasons stated in previous posts, we were selling may CRT installs then.
My own experiences ALL that I have to go by. I also have a BK 445 that is a great tester but I only push the button if the H-K will not bring it up.
The B&K WILL destroy a cathode with is capacitive discharge method.
You have to try hard with the H-K but it is possible if you're not being gentle. What it does is place 300 VDC across cathode and grid, while you vary filament, both gun current and ballast lamp brightness will let you know how heavy you lean on it. Releasing a button of lights flash on.