Westinghouse K840CK15 Restoration

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I found this researching early Quad recorders.

Per Ed Reitan: * During the restoration of the Eisenhower and Astaire tapes: * “I use the terminology "RCA Labs Color" for the format of the original Eisenhower, Astaire, and other NBC color tapes used on the modified Ampex machines * (monochrome to color) * at Burbank from early 1958 through at least April 1959," he said.

“ I suggest the term 'RCA Broadcast Color' for the format of the tapes produced by the RCA TRT-1AC, the first color recorder produced by RCA Broadcast of Camden, N.J., and also used by NBC at Burbank starting in April, 1958," Reitan advised. “

" These are distinguished from tapes made to the later “Low Band Color“ standard later promulgated by SMPTE."

His comments suggest something other than 1953 NTSC color, but better than SMPTE-C. I wonder what color metrics were used in the modified VTR’s and later in the production RCA TRT-1AC?

Starting in June, 1955 with the introduction of the RCA CTC-4 the WCG of the 15GP22 and 21CT55 were changed to less saturated colors according to comments read in this forum.

* Added by author.

15GP22 used in our restored Westinghouse H840CK15.

EDIT: To add to the question, I’ve read the “ RCA Labs heterodyne color” as used in the above VTR’s was low band color and replaced by high band color in the 70’s?