RCA 21CT55 B8802897 is Alive!

[Tomcomm]

Some misconceptions regarding this phosphor spectral analysis procedure seems to exist. My objective was to evaluate its potential to determine the relative spectral purity of the original NTSC spec’d dim CRTs versus the later, brighter CRTs e.g. 21FBP22A:
1) Only previous informal archive screenshot JPGs were used. No rigorous colorbar setup was used regarding black level, chroma level or luminance (contrast) level. All screenshots were taken in total darkness. Purity and focus were always good.
2) The playback LCD monitor is used only to direct the location of the virtual pointer over the JPG image. It’s chroma characteristics contributes nothing to the JPG phosphor contamination determination. Only the Canon S40 sensor can influence the results.
What is needed now is member postings to this thread their quality colorbar screenshots of their 15GP22, 21CYP22, gray 21AXP22A , green 21AXP22 , green 21FBP22 and gray 21FBP22A all taken in total darkness. Thanks for your interest and cooperation