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This is the first film I've seen that showed all the steps to this degree. Some of the details that you might not think of as proprietary actually could be quite critical, for example the exact tilt and rotation rate of the faceplate while the phosphor is applied. At one time, Sylvania was leading the pack in incremental improvements in tube brightness, and they came up with a particularly thick phosphor slurry that improved brightness. Motorola had no problem duplicating the results, except that first trials resulted in visible swirl marks in the picture, until they also discovered the required tilt, rotation speed, and application volume/rate. At one point, employees were requested to take home two identical receivers and watch them side by side, the only difference being the new process in one tube. We were to observe silently and ask others to compare the sets without any prompting of what the difference might be, to see if swirls were visible to untrained eyes.
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