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Somebody asked me that question, cos apparently they have this prototype picture tube, there were only like three of them made or something like that. It's supposed to be very similar to a commercially manufactured tube, but the one that went into mass production has some small changes.
From what he told me, he stupidly knocked the tip of it off on accident and it lost its vacuum.
The only other stuff I know is that it's an all glass picture tube, was made sometime in the 80's. It's a color tube, and apparently it worked very well for being a prototype. No clue as to who made it.
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