Work on the Hydrofeed- master recording lathe actually began almost 20 years ago. The increased standards of performance required to produce the microgroove LP record are easily met by this new development. Basically this lathe differs from previous ones in the use of a hydraulic-feed system, for the transverse feed, rather than a lead screw. Many other improvements are described, such as automatic pitch control, reduction of wow, flutter, and rumble to very low levels, and automatic operation throughout the operating cycle.
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