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CRT production
The RCA redbook submission to the FCC says that RCA made tubes available to other manufacturers for experimentation starting in mid-1951. By March, 1953, 477 tubes had been sent to 177 companies, possibly including the experimental version of the 15GP22 which was around by that time. That is not clear from the text.
RCA also indicates that by June, 1953, 7000 tubes had been made at Lancaster of various designs beginning in October, 1951. But they also indicate that they only had about 400 on-hand. The others were removed from stock and parts salvaged. Sounds like the Philco Apple failure rate.
There is also mention of a 21" tube in July, 1951, but it only had a useable round picture of 15 3/8" wide. Just a larger version of the flat-plate 16" tube that started this thread. The CBS-Hytron 21" curved front was yet to come.
Dave A
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