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A color wheel running on the CBS standard, such as this set was intended to adapt to, works very well, with "imperceptible" flicker--that is, most people's persistence of vision is such that the rate of 72 color fields per second making 24 complete color frames is too rapid to flicker. I can see the flicker in a CBS color picture. To my eyes, it's almost subliminal . . . but not quite. NTSC-to-field sequential color wheels from ca. 1956, like the Colortel, can work well and reliably, but they flicker like a motherf***er due to the low frame rate. Whereas an ordinary color receiver displays 30 complete color frames per second, with a color wheel displaying NTSC, the color signal has to be chopped up into 30 fields per second. 10 fps for any type of motion-picture is going to flicker like mad. If you don't mind that, then they work fine.
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