The final colour picture was created by combining the chrominance and luminance signals, but the technicians simply switched off the colour tubes whilst this dispute took place.
2.
With such a camera, a sharp black and white picture was always assured, as it was not necessary to combine signals from the three colour tubes to provide the luminance detail.
3.
Disadvantages of a four tube system were increased costs, a larger and heavier camera, and reduced light levels on the colour tubes ( light was stolen by the luminance tube ), making such a camera less suitable for outside broadcasts in low ambient lighting.
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