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Remember that in 1961 they were still into 21" round tubes with no rectangulars in sight. I doubt seriously their technology at that time could have produced the tube that ETF has at that time. It looks like something from the later '70's to me if that early. Remember SONY had that flat CRT in their "Watchmans" only in B&W in the '80's some 25 years later. COLOR flat tubes in 1961?? I don't think so as they were not that advanced. B&W I may hardly believe that, but not color. There was too much geometry in that tube to understand in 1961.
I would like to know what they were doing then if I am wrong here. There were no IC's back then and only IF they used discreet SS parts available then, there is no way in heck they could put them all in that hand held TV!! Perhaps there was a huge backpack to go along with it! Even so, CRT design was not that advanced for color back then. OK guys, prove me wrong here!! BTW, just where would the shadow mask have been??? Julian KJ4NCW
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julian Last edited by julianburke; 04-13-2012 at 02:34 PM. |
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Good question... and how would convergence of the three beams been obtained?... an almost impossible task, IMHO. Beam index technology would seem to be more practical. By the mid 80s, A lollipop style color CRT using beam index design may perhaps have made into an actual product... some discussion of the Sanyo Prototype/Product about halfway through this thread: http://www.videokarma.org/showthread.php?t=248210 jr |
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See photo and text from report: http://www.visions4.net/journal/time...creen-tv-1966/
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A few things come to mind: !. Since the unit is on a long cable, the complex driving circuitry could have been located apart from the display, making for a compact unit, even in the era before complicated ICs, so perhaps it would have been possible. 2. Perhaps the body of the unit could have contained a small monochrome CRT and a mirror/lens system similar to the Philco Safari. Again could have been possible with remote electronics. 3. The caption says "talk to a nurse and operate a combination radio-television set"...Which may be an indication that this was just a "nurse call button" combined with a fancy radio/tv remote control... but it sure looks like a display screen. Scratching my head over this one, thanks for posting it! jr |
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See photo of working 6 inch flat color CRT. http://www.visions4.net/journal/time...wordpress-525/
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Audiokarma |
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jr Last edited by jr_tech; 04-12-2012 at 11:00 PM. |
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Last edited by old_tv_nut; 04-13-2012 at 07:34 PM. |
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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 |
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Philco's Safari had a different form factor and used a much smaller CRT, but it was a real brick, as well. Phil Nelson |
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