Most of the sets below were receivers used in "Field
Testing" of the NTSC Standards from late 1951 until May 1953. The NTSC
submitted its petition after this testing to the FCC in July 1953.
In March, 1950 RCA demonstrated its color sytem to the FCC. On the left is a set using a single gun color tube. In the center is a black and white set, and on the right is a set using a tricolor tube.