Quote:
Originally Posted by julianburke
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.
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I agree, The "TV set" shown in 1961 was likely pretty much an empty box mock-up to demonstrate a concept. The lollipop CRT at ETF looks like a later (late 70s I think is a good guess) engineering special that likely
could produce an image. Careful examination of the CRT at ETF should reveal if it was Monochrome or color. I would guess monochrome.
Quote:
Originally Posted by julianburke
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!!
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Agree... If the ETF prototype CRT was color (doubtful IMHO), It would have taken a ton of electronics to produce proper geometry and convergence, but for engineering work, a rack full of special driver circuits could have been used.
Quote:
Originally Posted by julianburke
BTW, where would the shadow mask have been???
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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