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-   -   That broke my heart!!! (http://www.videokarma.org/showthread.php?t=251992)

old_tv_nut 09-11-2011 05:32 PM

see this page for a picture of the cutaway that ETF has:
http://www.earlytelevision.org/2006_convention.html

Robert Grant 09-11-2011 10:19 PM

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.

old_tv_nut 09-11-2011 10:23 PM

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.

fox_rivers 02-27-2012 12:13 AM

Hope he got sick from the Philco's phosphor and from the mercury contained in the CCFL backlight that flat panel had.

akent36 02-29-2012 11:45 AM

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.

charokeeroad 03-02-2012 02:30 PM

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)

old_tv_nut 03-02-2012 07:49 PM

Quote:

Originally Posted by charokeeroad (Post 3028782)
hunerd dollars to the first guy that can cut a CRT in half from front to back without damage!
...

To the CRT or himself?

charokeeroad 03-03-2012 02:18 AM

Quote:

Originally Posted by old_tv_nut (Post 3028820)
To the CRT or himself?

Either way but start with the CRT.


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