A Compact, Alternating-Current Operated Speech Input Equipment

This paper describes a simple, easily installed, alternating-current operated, speech input equipment primarily intended for installation as studio equipment for local channel broadcast stations or for permanent installation at outside pick-up points frequently used by large broadcast stations. The features of this equipment are the use of moving coil microphones, the inclusion of high quality, high gain, all alternating-current operated amplifiers capable of delivering a high output level. Mechanically, the principal component is a single factory-assembled and -wired metal cabinet.