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Picture Tubes

15GP22 Color CRT

The 15GP22 was the first production color picture tube, made in 1954. It was used in the RCA CT-100 and most other 15 inch sets made in that year. The CBS 15HP22 was similar, but easier to manufacture. The 15GP22 was quickly replaced by the 21 inch 21AXP22, which was used in the 1955 model sets. Here is an article about installing this tube and one announcing its sale (courtesy of Steve Dichter).

These tubes suffered from a leakage problem, and most of the surviving tubes are full of air. Since 2008 there have been a number of attempts to rebuild the tubes and solve the leakage problem. John Folsom and Bob Galanter worked for months with Scotty at Hawkeye and were ultimately unsuccessful.

In 2010 RACS, a French company, successfully rebuilt a 15GP22. That tube is still working in a set at the museum.

Based on that success, a number of tubes were shipped to RACS. However, they have been unable to reliably seal the metal ultor ring using frit.

John Yurkon has undertaken a project to eliminate the ring, and to make an all-glass 15GP22.

Courtesy of Dave Arland

Tele-Tech, February 1954

New Era, January 1, 1954

Popular Science, November 1953

Thomas Electronics brochure

Courtesy of Dave Corbitt

Courtesy of Rich Mensinger