Journal of the Society of Motion Picture and Television Engineers (1950-1954)

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Fig. 4. Preamplifier cases for Simplex four-track magnetic sound system, showing plug-in preamplifiers. Fig. 5. Power-supply switcher case for Simplex four-track magnetic sound system, showing one plug-in power supply and two plug-in effects switchers. Athey, Borberg and White: Multitrack Sound Reproducer 225