The basic design principles and constructional details of a new two speed 1/4 in. mono-stereo studio tape recorder are described. The tape transport of the machine is divided into seven separate modules which can be lifted easily from the cast aluminum frame of the transport. Reed relays are used throughout except for motor switching; the unit incorporates a simple transistor logic requiring only 16 contacts for the whole transport with full remote control. The circuits used in the electronic units are conventional, except for the reproducing preamplifier which uses a very low-noise amplifier. The technical specifications of the recorder are shown as statistical distributions of the measured data from a large number of recorders, and the editing accessories as well as a version of the basic recorder built for synchronous recording in motion pictures are described.
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https://aes2.org/publications/elibrary-page/?id=1545
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