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The Development of a Double Rotating Coil Pickup

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It happens seldom that an entire industry is called upon to design a complete new line of equipment using an entirely new concept. Since the first successful demonstration of stereo disc in the fall of 1957, a whole new system of recording and reproducing music has been developed and put into actual commerical practice in a space of less than one full year's time. Such a development has been difficult in the extreme for all manufacturers, but perhaps most so for makers of cutters and playback pickups since entirely new units had to be designed. In the case of the reproducer, two motions instead of one had to be reproduced; two elements instead of one coupled to the stylus tip. This design work was further complicated by the lack of prior basic reference works as well as lack of reliable test records and standards.

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AES - Audio Engineering Society