General > General Technical Chat

How a color picture tube (CRT) is manufactured.

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MikeK:

--- Quote from: BrianHG on November 09, 2022, 09:23:27 pm ---SONY TRINITRON Television: HOW IT WAS MADE



--- End quote ---

I'm not sure why they credited Pittsburgh.  The Sony plant was actually one county over in Westmoreland Co.  I think that's Mt. Pleasant.  But Pittsburgh is the nearest big city.  It was previously the VW plant...making many VW Rabbits and even my [dearly departed] 1986 GTI.

tooki:

--- Quote from: coppice on November 09, 2022, 10:56:04 pm ---I wonder how the flat screen CRT business really worked out? It seems they took years to perfect, so presumably a lot of investment went into them. They never really took over the market, so the volumes were limited compared to the preceding tubes. Then their market window started to close quite quickly, as other screen technologies took over.

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Honestly, I wouldn’t say that they managed to perfect them. The corner sharpness of them, even with fancy dynamic focus, simply isn’t as good as curvier CRTs. Any deviation from a spherical surface leads to dot distortion, since the beam isn’t hitting perfectly perpendicularly. This distortion was exacerbated by the simultaneous push towards shorter tubes. If the tube could be 2 meters long, then it’d probably appear razor sharp, but with the short-neck tubes, it meant significant distortion of the dot in the corners. I believe they even used astigmatic beam lenses to try and compensate for this, but it couldn’t do it perfectly.

As much as I admire the CRT, and enjoyed using them, I don’t think I’d want to go back, even if space and weight weren’t an issue.

james_s:
I still think a good CRT looks great. I have a 27" Sony Trinitron XBR in my rec room, mostly it's used for vintage console games but I do use it for watching content sometimes and despite being 480i the picture is fantastic. It's *far* better than the specs would imply.

I'm also a big fan of vector arcade games and for those there is no substitute for a CRT. Nothing can touch the dynamic range of the monochrome vector monitor used in Asteroids. A person that has only played that on an emulator has never really played it.

IDEngineer:
+1 for CRT vector displays. Nothing rastered nor masked can match their appearance.

Did you ever play Gravitar? Vector perfection. I'd love to own one, but must be satisfied with my original Joust machine (which now needs debugging, sadly).

coppice:

--- Quote from: IDEngineer on November 12, 2022, 04:37:51 pm ---+1 for CRT vector displays. Nothing rastered nor masked can match their appearance.

Did you ever play Gravitar? Vector perfection. I'd love to own one, but must be satisfied with my original Joust machine (which now needs debugging, sadly).

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Penetron and Tektronix style storage screens could be really excellent. Other types of vector displays were not so great. Just trying to move the beam around fast enough to display anything complex could be a real problem.

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