First flat-faced CRT?

[Username1]

I thought it was RCA when they came out with that 26 or 27" mostly flat face tube....
It was really square too.... Is that the one where if the shadow mask got hot they were
warping.... Wasn't that early 80's....?

[rpm1200]

Originally Posted by Username1

I thought it was RCA when they came out with that 26 or 27" mostly flat face tube....
It was really square too.... Is that the one where if the shadow mask got hot they were
warping.... Wasn't that early 80's....?

I think that was around '87... the second gen Dimensia TV being one example. NEC also had a 27-inch "nearly flat" tube around then. Then in the early 90s Panasonic came out with the "Gaoo Superflat" series, same idea.

Some of the small portable color TVs had tubes very close to flat and square.

I used to have one of those Zenith Data Systems monitors. The screen was ruler-flat, but the picture appeared to bow in very subtly at the middle. I was told that was an optical illusion due to being used to curved-screen monitors, but did not observe that effect with later flat CRT computer monitors (like the Sony Trinitron ones that came out around 2000).

[JBL_1]

Originally Posted by rpm1200

I think that was around '87... the second gen Dimensia TV being one example.

I haven't thought about that set for years. Was just coming out when I joined RCA in 1984. Used the CTC-133 chassis. Wasn't completely flat, had two bumps in the middle. Remember the guy that made the blister blaster circuit that was tacked in at the last minute to pull down the contrast when bright spots appears for a long period of time...

[andy]

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