A sound system for cinematographic projection and similar applications (Machine-translation by Google Translate, not legally binding)

摘要

Sound system for cinematrographic projection and similar applications, characterized by the provision of an amplifier valve and voltage rectifier in the input signal from the normal cabin amplifier, applying the voltage rectified by the diode of this valve to a second, whose voltage the plate receives it through a voltage divider of several points or determined resistances. (Machine-translation by Google Translate, not legally binding)