During the past twenty years, electrical phonograph drive systems have remained practically unchanged, and many of their basic shortcomings which give rise to wow, flutter, and rumble still persist. One solution to some of these shortcomings is described in the form of an electronic drive turntable, consisting of a variable frequency oscillator and a power amplifier driving a hysteresis-synchronous motor capable of working over a wide frequency and speed range. Such a drive system makes speed changing extremely simple since it reduces the number of necessary mechanical linkages in the drive system and has certain other advantages over mechanical transmission used in turntables.
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