The audio engineer may apply transistors advantageously to portable, battery-operated equipment. The application of junction transistors to a microphone preamplifier and to a remote broadcast mixer-amplifer is described. The principles and techniques employed are also applicable to other audio devices where high gain and high efficiency are required. It is felt that although transistors may not replace vacuum tubes in applications where size, weight, and battery operation are unimportant, in special applications like those described in this paper, transistors have a definite place in audio equipment.
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