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I would caution against using only R and B from the CCD. The reason is that any imbalance between G (derived from the tube) and R and B (from the CCD) will result in a green or magenta cast, which is the most objectionable of color shifts. If you develop only Y from the tube, and color difference signals from the CCD RGB, then mismatches will show only as an error in color saturation - much more tolerable.
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