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While googling around, I came across an old thread here (2003) about red phosphors (can't figure out how to find it). Someone said that he heard you could judge the quality of the red (too orange or not) by looking at the yellow color bar.
I want to point out that this is not the case. Due to the rules of color mixture, if the bars are demodulated in the standard NTSC way (that is, red and green are driven to the same level as white), then the yellow bar color will be determined by the blue phosphor and the white point setting. This is because the yellow and blue must add up to make white.
There is an additional fly in the ointment, in that the color demodulators may be designed to have different gains and phases from the standard NTSC in order to partially compensate for non-standard phosphors. In this case, one or both of the red and green guns may be overdriven or underdriven on the yellow color bar, and the blue may be overdriven as well (driven below black). SO, there are many other effects which change the color of the yellow bar, and the color of the red phosphor is a relatively minor part.
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