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At the dawn of color Tv cameras, all the manufactures were experimenting as to how it could be done. At, of course, the lowest price, biggest profit. One of the things tried was a 2 tube camera. Marconi, amongst others, made an experimental color camera in early 1954. It used a 3" IO for luminance and a second 3" IO with a 2 colour striped filter. This gave, effectively, your Y,R,B camera. Marconi did not pursue it and moved onto conventional 3 tube cameras similar to the RCA TK40. The two tube technique was also taken up by the home video market. prior to the availability of 3 color striped tubes.
Brian S
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