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once a color film chain, for example, was added at a monochrome tv station, and the sync gen was changed to ‘color’ then the station forever just ran on color sync standards, 15734H and 29.97V. Only the color equipment output burst and chroma.
At home tv sets or to other tv station equipment there was zero noticeable difference except: if you had any hum in video equipment (common was weak mercury rectifiers in the transmitter) any hum bars now float slowly through the pix. and, heater to cathode leakage was a common problem with tubes.
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