Quote:
Originally Posted by oldtvman
Are there any visual comparisons between the CT 100 and the Westinghouse?
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There should be stronger color detail for orange and cyan colors in the CT-100, but I think it's nearly impossible to see with ordinary pictures on the small screen of the 15GP22. Both sets demodulate to the nominal NTSC colors for coarser details.
I have seen CT-100s that appeared to have weak color matrix tubes or out of spec components that clipped the signals driving the CRT, for example with the yellow in a test pattern getting desaturated towards white. I also note that when ETF had three CT-100s in a row, they all had somewhat different color. I think it could be explained mainly by set-up accuracy (white color was different) plus to some extent old components being out of tolerance.
The specs on the 15GP22 show a rather wide variation in cutoff voltage and drive requirements from tube to tube. Cutoff can be adjusted rather easily by eye, but white point is very difficult to get correct without a photoelectric color meter, so if that needed to be adjusted after the set left the factory it would probably have a wide variation. This was made worse by the huge difference in drive level between R, G, and B required by the 15GP22. Red gain had to run full blast while green and especially blue had to be cranked way down. Pictures would often end up too blue when adjusted by eye, which was evident in the side-by-side sets at ETF.