
via
this auction "vintage“maestro “maestro rhythm” MRQ-1 Model Drum Machine Synthesizer c. 1970, made in Lincolnwood, Illinois, serial #17583 , wood grained vinyl finish, wood, metal. Has built in speaker and 8 different thymic settings. Each setting can be varied in 3 ways: by Volume, by Balance, and by Tempo. Back has a 1/4 inch external amplifier output and a 1/4 inch Foot Swithc output. 50 watts, 115 volts, 60 hertz. Comes with a substantial length electric cord. Metalic plate at back is printed Maestro Sound Sytem. Patents Pending, Gibsoninc., Lincolnwood, ILL. Height is 7 1/2 in. (19 cm), 12 1/8 in. (30.8 cm.) width, and 9 5/8 in. (24.4 cm.) deep."