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I second the amazement at the color you get from a P4 source. IIRC, the P4 formula changed over the years - by the time that B&W was being phased out in favor of color, it had settled on a sulfide formulation that was a mixture of a violet-blue component and a greenish-yellow component. It doesn't seem that would give a lot of red. If you look at a white picture area on such a P4 tube with a small microscope or powerful magnifier, you can see the the two colors in separate phosphor grains. It would be interesting to know what the 12KP4 screen looks like under magnification
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