How I Set Up My CT-100

[Tom Albrecht]

I would be interested to learn a bit more about "matrix changes" to NTSC over the years. I don't know a lot of the background information on this subject, but it would seem logical to me that if the CRT phosphor colors changed over the years from deep red to a more orange red, then the cameras and modulation scheme would also have been adjusted to a different "standard." Using the old deep red phosphors like a CT-100 with 15GP22 does would then result in some errors in color using today's cameras.

Would it be correct to interpret this to mean that the CT-100 had good color fidelity back in 1954 when used with a camera designed for it, but with today's cameras, there are some color errors?

As I compare what I see on the CT-100 to what I see on my Panasonic HD CRT set (from 2004), I do see what appear to be "errors" in the red, orange, and yellow regime on the CT-100. Is this in part because of changes in cameras over the years? There could well be some nonoptimal adjustments in my set, of course -- I'm not assuming my set is dialed in perfectly. The "errors" are not really problematic -- but it would be interesting to understand them better.

I would imagine that the matrix depends on the filters used to separate RGB in the camera, the mathmatical relationships used in the RGB adders in the set (and some corresponding system in the camera/modulator), and the actual phosphor colors in the CRT.

Can one of you shed more light on this?