Re: Covering burn in (was RE: Picture tube re-builder?)

Many years ago our Canadian Standards Association used to have a booth at
the large Toronto Exhibition (CNE) where they had a picture tube supported
in a frame in a large glass box. They would then remotely swing a sled
hammer at the screen...gave one a whole lot of respect for implosions!
Glass went flying out the rear and sides and bounced off the inside walls
of the display booth glass shield...

Modern tubes are much safer, this was back in the days when thick glass
screens were the exception, not the rule for TV's.

John :-#)#

At 12:29 PM 03/07/2001, you wrote:
>>Oh please assure me nobody is going to aim a heat gun at the face of a
>>picture
>>tube that still has a vacuum in it.
>
>Notice how I said "the glass face from an old tube" and not the whole
>tube. (The thought had occurred to me too. ;-)
>
>>Remember, a CRT is a bomb. As long as you don't set it off it's safe
>>enough. I
>>always cringe a little at trade shows around the booth that has a motorized
>>mallet repeatedly striking the front of an operating monitor. I realize they
>>are trying to prove something about how their touch panel overlay can take
>>abuse, but it's still an incredibly bad idea.
>
>You know, we always hear this, but I can't really decide how much is just
>hype and FUD. The word "bomb" tends to conjure up firey explosions and
>the thought of losing limbs when it goes off. (Actually, the dictionary
>definition hinges on "explosion" and not an implosion like a CRT.) Every
>CRT I've cracked, shot, and generally broken hasn't done much more than
>spit some broken glass a few feet in a most anti-climactic manner. I've
>dropped glasses in the kitchen with more spectacular results!
>
>Anyone here *tried* to break the front face of an old 19" monitor with a
>hammer? (I have. ;-) They're remarkably tough. Newer ones probably use
>thinner glass (and flatter faces) and are more damage prone though. (An
>old Sony 19" TV I had actually took about 5 .22 rimfire slugs from ~15
>feet before finally puncturing with a wimpy "ssssssssss" noise.) Knocking
>the end of a tube with a hammer makes an interesting "foomp", and I
>wouldn't want to be holding it when it did, but I don't find it too
>menacing. I think the real risk is *dropping* a tube so that it shatters
>on impact.
>That could be pretty dangerous from the flying glass perspective (but
>then, so would be dropping a plate-glass window, or a big glass vase).
>
>Anyway, just my $0.02.
>
>-Clay
>_________________________________________________________________
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>
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Received on Tue Jul 3 17:06:44 2001