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21FBP22A Mini-Rejuvenation
Thanks for your renewed interest in the "21CT55 Test-Bed". Today I turned it on and still got immediate full brightness with perfect focus and boostless CRT heaters at 5.94vac! I agree with Pentode that running the 21FBP22A at 7.64VAC for 2 hours seems to have accomplish a very gentle CRT rejuvenation. It probably cleaned the cathodes and possibly burned-off any control grid contamination. The cut-off glow is virtually gone!
Hey, if all I have to do is occasionally run the Big Sucker at 7-8vac for a couple of hours to restore performance, I think I'll keep it....Tom
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