Why did others drop out of early color manufacturing?

[oldtvman]

I have never restored any B & W set. Mainly because as a young guy, it was b & w I was trying to get away from! Brings back too many (I wish I had a color tv memories)

[old_tv_nut]

Originally Posted by andy

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I've always been interested in those Zenith flat CRTs. I broke one open a few years ago and they are ruler flat on the inside too. They look concave because of the optical properties of the glass. .

Yes, they were flat inside. I did some calculations on the refraction, and it looked like the concave effect from that would be much less than the apparent concavity. Also, if there is even a little pincushion distortion, it adds to the appearance of a concave image.