RCA vs CBS

[Penthode]

I had no idea CBS would have attempted to use a B&W TK11 for NTSC color!

It is does appear feasible however. And the CBS method would eliminate convergence problems. My guess how it worked was like this:

The only modification would to speed up the disc to 6 x 29.97Hz (NTSC picture rate). This means the CBS camera color field rate would be raised from 144 f/s (6 x 24) to 179.82 f/s (6 x 29.97). The transfer tubes are simply primitive rescaling converters.

I suspect the picture resolution was not as good as a TK40, but the solution would at least have likely made Bill Paley less angry with Peter Goldmark.

Funny I saw Wayne's excellent descriptive posting only after I guessed the process. The article said 180 color frames per second nominal but the actual NTSC rate would be 179.82 color frames per second.