Mixer and Dialogue Equalizer for motion picture sound, from the 1940s. Obtained from a famous film processing facility in New York, NY. Each of the two inputs uses a D-175873 Western Electric microphone transformer to drive a 1620 pentode (similar or identical to 6J7), followed by a classic passive equalizer. Each channel then passes through a Daven stepped attenuator and the two amplified, equaized paths are summed and output through a PEC/Direct selector switch. This is classic Western Electric film sound production gear and is built like a tank (though not as heavy). Includes mating Canon connectors, copies of the mixer schematic, power supply schematic and other related documents. Power supply is simple but is not included and must be supplied by purchaser. Only one in stock.