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In the 60's when we were replacing the round tubes, I always preferred the sulphide (green tube) screen as I always thought they had a richer color to them-much like a Technicolor picture. I remember doing a CTC5 with a sulphide FB and what a picture! There was also a difference in price between the two as the gray screen "rare earth" was about $30 more. In the early 70's I remember the dud allowance being removed on the sulphide as we didn't require a dud on those-just the rare earth. We also sold a lot of Zenith tubes and they didn't require a dud on the roundies so we had a lot of those duds on hand. I wish I had them now!
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julian
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