A Professional Magnetic-Recording System for Use with 35-, 17½- and 16-Mm Films
Glen R. Crane, John G. Frayne, Ellis W. Templin · Journal of the Society of Motion Picture and Television Engineers · 1951
This paper describes a portable magnetic-recording system for producing high-quality sound track in synchronism with pictures. The system has been designed to enable magnetic recording to conform with standard motion picture studio operating practices. A number of features such as high-speed rewind, interlocked-switching facilities, one basic type of amplifier and the use of miniature tubes throughout have been incorporated in the system.