[time-nuts] [OT] degausing

jimlux jimlux at earthlink.net
Fri Apr 16 13:48:54 UTC 2010

Chuck Harris wrote:
> Are they really?  For some reason, every Trinitron I have ever seen
> has clusters of little stick on magnets placed here and there on the
> back of the glass envelope.
> The trinitron has a shadowmask.  It is a grill of highly tensioned wires
> that are positioned just behind the screen.  The original trinitron tube
> was a little 5 inch diagonal CRT.  It had to be small because the wires
> tended to vibrate if the set was bumped, and that made for some very odd
> displays.  The later larger tubes had horizontal titanium wires welded to
> the backs of the shadow mask wires every 5 or 10 inches, to prevent the
> psychedelic color fest that happened when the CRT got bumped.
> The trinitron has three very carefully aligned cathodes in the gun.  They
> are positioned side-by-side, creating the slight different projection
> angles necessary to cause the long vertical slots formed by the shadow mask
> to eclipse the appropriate color bands on the screen.
> I'm not sure what you are describing; it sure sounds cool; but it isn't
> a trinitron.
> Can you find some references?  I'd like to read up on it.

You're right...
I must have been thinking about another scheme.. Now I'll have to go 
find it.

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