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see this page for a picture of the cutaway that ETF has:
http://www.earlytelevision.org/2006_convention.html |
May I also mention that "invar" is a trademark for a metal alloy that can withstand a significant range of temperatures without contracting or expanding (most metals expand when heated, a few contract, IIRC).
Without invar, the front of a CRT color TV set would have to be kept at exactly the right temperature, lest the mask change size, and the beams from the three electron guns would strike the wrong color dots around the edges. |
Actually, Invar is not the only fix for shadow mask expansion. There were patents granted (and used) for expansion-compensating shadow mask mounts such that when the mask expanded, it would move closer to the screen to compensate.
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Hope he got sick from the Philco's phosphor and from the mercury contained in the CCFL backlight that flat panel had.
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Not much worse than all the TV's, radios and console stereos that go into a dumpster after the donation auctions at the major swapmeets every year.
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hunerd dollars to the first guy that can cut a CRT in half from front to back without damage!
(must be a dead one to start with of course) |
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