Museum Hours:

Saturday 10-6

Sunday 12-5


Picture Tubes


Introduced by RCA in 1955. This was the first 21 inch tube manufactured for sale, and was used in almost all 1955-57sets.

Development of a 21 Inch Metal-Envelope Color Kinescope
Deflection and Convergence of the 21 Inch Color Kinescope
Recent Improvements in the 21AXP22 Color Kinescope

Above documents courtesy of Dave Sica

Life, February 14 1955

Because the tube had a metal shell, a plastic insulation shroud was needed