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Based on what I've seen and heard, Sylvania was slightly ahead of all the others on their phosphor formulation. I've seen some 60's Sylvania sets give a super bright, super vivid picture. I think it may have had something to do with Sylvania being a big light-bulb manufacturer. Maybe they had lots of experience in phosphor development from working with fluorescent and mercury vapor lamps. I have a rebuilt Sylvania Color Bright tube, and as you can see, even it gives a very impressive picture. Here it is in my RCA CTC-40.
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