[QUOTE=jr_tech;2956684]Great write-up
That is funny about the color, but P-4 phosphor is actually a mix of a "yellow" phosphor which peaks at about 550 nanometers and a "blue" phosphor which peaks at about 450 nanometers... it appears that the blue "ages" faster than the yellow under years of electron bombardment....
I was going to ask about that. I've seen some screenshots of vintage sets here on the site & it seemed to me that many had a "sepia" coloration on the CRT. Didn't know if that was really the case(most late '50s & up B&W sets look "blue-ish" to me in screen captures). I thought maybe it was a setting on the digital camera used for the shot, but was never sure. Actually, I think the "sepia" effect looks better than the "blue-ish" one usually seen. Just curious about that, never gave a thought about the original phosphor colors of early CRTs,