|
Results of glow survey
As it stands now, Bob G and Wayne B tests "noglow" but have recent reguned 21AXP22s, no chance of grid contamination from cathode deposits. John F's tests noglow from his original 21AXP22 in his CTC4! This crt is at least 10 years older than my 21FBP22A and should be more contaminated than mine, right. Pete D will test his 15GP22 just as soon as he gets it running again. I need more glow testing of non-reguned roundys like mine.
So out of four roundys tested, my 21FBP22A is the only "glower". Has it been this way when I got it 40 years ago but I never noticed or have I abused it by running over 32kv ultor the last couple of years? Anyway, the glow is only noticeable during very dark scenes when viewed in a totally dark room. I can live with this considering the only fix is to find a known good 21FB cheap (ha) or let Scotty rebuild one for $400 plus a couple hundred two-way risky shipping.
Rebuilding a 21AXP22 if I could find a core is out of the question. There would be the additional core charge and I would have to find an ultor hv boot or hobble up something and I'd be back to 1964 when I converted over to the brighter 21FBP22 in the first place. My 21CT55 is not a restoration, picture quality is the objective here, not proper configuration.
If I get desperate, I can always install my spare 21FBP22 green screen sulfide and hope its been spared the glow of the present gray screen 21FBP22A rare-earth..........Tom
|