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A high price was certainly justified for a tube with controlled phosphors. They would be affected very easily by contamination, so applying them without getting contamination from/to a mass production run for TV sets could be a difficult project; might involve wasting material and time due to cleaning equipment before and after, etc.
Also, developing the controlled phosphor in the first place could be a problem. I wonder if Conrac negotiated shipping controlled phosphors from a single batch to the successive tube manufacturers? Seems I recall stories about the existence of just three barrels of the controlled phosphors that were used for all tubes.
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