21-CT-55 has a new home

[old_tv_nut]

Originally Posted by miniman82

Wow, outstanding work!

Looks like they are pretty close, for the most part. I'd bet the later tubes are farther apart than the early ones, have you tested any of them?

The 1931 CIE chart shown exaggerates the difference in green and minimizes it in blue. The difference between the CBS blue and others is as significant as the difference in green between the SMPTE and others. There is an alternate plot developed in 1976 that is closer to uniform variation.

Here are the two versions of the plot (1931, x,y; 1976 u',v') comparing several color gamuts:


Technicolor at three different dye concentrations
(Many thanks to Ed Reitan for supplying the dye spectral curves used to calculate these colors);

NTSC;
sRGB (digital still cameras and HDTV);
Fujichrome test target;
Kodachrome test target;
Pointer's surface colors (a survey of the range of natural, paint, and printed colors).

Note the more significant differences in the blue and magenta region shown on the u', v' diagram.