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#1
06-21-2011, 11:04 AM
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Pete, I agree. When I get a chance, I will examine my other two metal bell prototypes. Unfortunately, they are both in sets (the Sparton and CBS prototypes), and getting to where I can read the rim numbers is a very non-trivial task. But I guess now I need to do it. One of these tube is a 6-bolt 20 pin base type, the other is a 3 bolt 20 pin base type. I would expect the rim numbers to be greater than Nick's if our theories are correct.
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John Folsom 
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#2
06-21-2011, 01:10 PM
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Phil Nelson posted on his great vintage TV site this CT-100 ad from RCA. Read the text for the amounts and brief history of RCA's prototype and CT-100 tubes made available to other manufacturers in the early '50's.This was not totally altruistic on RCA's or Sarnoff's part. They wanted color TV in the public's hands and if it took other manufacturers to get the ball rolling, so be it.
RCACT-10015GP22KinescopeAd.jpg http://antiqueradio.org/art/RCACT-10...inescopeAd.jpg -Steve D.
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Please visit my CT-100, CTC-5, vintage color tv site: http://www.wtv-zone.com/Stevetek/
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