|
When I read old tv nut's post yesterday I thought, eh, he is full of hot air! All the phosphors are going to be the same color!
So last night I took my little 8x magnifying glass and did a survey:
21AXP22(A?) I couldn't get close enough, with the safety glass, to use the magnifier but with the naked eye it is pretty clear that all three are uniformly light gray
21FJP22 (various, all olive green) The 3 phosphors are 3 different colors! I never looked close enough to notice this before. One is gray, one is olive green (perhaps a little lighter) and the third is a darker green, sort of a mustard color. That one appeared to have some impurities to it, colorwise.
21" rectangular in a Motorola (late sixties) 2 of the phosphors are gray and one is light olive
Older GE Portacolor with dot matrix crt-2 are gray and one is a pale grayish green.
18" GE & RCA & newer Portacolor-all gray
1990 Sylvania 20"-you can actually see the colors-one stripe is reddish, another bluish, the third a grayish green
I also took a look at a dud Philco RE21FJP22 (rare earth phosphor) that I have in the attic. Tough to see because of cataracts but it looks all gray. And then there is the tube in my Zenith 25MC33; a mid-70s Zenith branded but Sylvania EIA rebuilt tube. All light gray.
I have not tried to figure out which is which as of yet. It makes me crosseyed enough already! I guess if I can focus on one set of phosphors while working the brightness control I can figure it out. I'm guessing the mustard color is the red?
__________________
Bryan
|