Quote:
Originally Posted by Electronic M
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Wayne/Old TV nut you are right the shadow mask implementation would be dimmer than NTSC on a shadow mask, but I think you overlooked the fact that the color filters in color wheel converters also significantly attenuate the light passing through them...I don't have the figures on hand, but I suspect the difference in brightness would not have been quite as substantial as one might think.
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The monochrome tube + wheel was probably about the same efficiency overall as the shadow mask, since the filters were not ideal and probably resulted in white brightness 20% or less of the bare monochrome tube. But - using the shadow mask for field sequential would mean both the shadow mask attenuation down to 15% of a monochrome tube, AND the 33% factor of each gun being on only one third of the time, so about 5% overall - roughly 1/3 to 1/4 the brightness of a color wheel set for the same beam current and high voltage. And then there are other factors such as the poor efficiency of the P22 red phosphor, compared to the poor output of P4 filtered through the red filter, etc., etc.