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The article mentions a paper by Mr. Tanner that was read at a 1966 IEEE convention. The IEEE website has many old archived documents. It would be fun to read that guy's paper, if available. Phil Nelson |
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Last edited by old_tv_nut; 04-13-2012 at 07:34 PM. |
Audiokarma |
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The limited color (2 color) tube might have been workable, but might not have been good enough to generate much interest and investment capitol for production start up costs. interesting, jr |
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DeLoss Tanner died (cerebral hemhorrage, IIRC) just before I got out of school and joined Motorola. I inherited a different project of his, a transistorized black and white TV that was an experiment in cost reducing any way conceivable. The set was breadboarded on a tinplated steel sheet. My first job was to buy a car battery and charger to run it. The IF transistors had no emitter degeneration and were current-biased by the AGC circuit. The CRT had been built from a cut-down glass milk bottle, with the bottom of the bottle as the screen. You could read the dairy's logo, stamped in the bottle bottom, in the picture; and it was, well, "milky" looking (no aluminization). The set basically worked, but there was no hope of holding tolerances for production. I got it running, and it went into storage or maybe got trashed, I don't recall; but at least it then was a documented experiment.
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As the author states, purple is not possible - but I have no idea what he means by "reddish blue" if it's not purple (which it couldn't be) - maybe he means it was slightly variable from slightly blue to slightly red. Here are some shots of Cliff Benham's 2-color field sequential set (left smaller screen) vs. ordinary 3-color (right screen), from the 2009 Early Television convention. P5010070 by old_tv_nut, on Flickr P5010072 by old_tv_nut, on Flickr P5010114 by old_tv_nut, on Flickr P5010115 by old_tv_nut, on Flickr Finally, 3-color bars on left, 2-color on right: P5010099 by old_tv_nut, on Flickr |
Audiokarma |
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jr |
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I've now sold the bridge a total of nine times. Wanna buy it?
Phil |
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If that flat screen two color CRT actually worked then it mat have been possible to make a three color tube by adding another layer to it.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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I don't see how. The glass that carries the phosphors has only two sides, and the idea is to have two beams approaching the opposite sides through vacuum.
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