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The MDS-1 professional reel tape recorder has been produced supposedly since 1948. It is intended for recording and playback of speech information and with the possibility of reprinting it on a typewriter. The tape recorder consists of a cabinet in which the chassis (LPM), recording, playback and rectifier amplifiers, a special typist table and a remote control panel with a microphone are placed. The remote control system (remote control) allows you to install the cabinet at a distance of 10 meters from the table of the typist, and the remote control with a microphone at a distance of 20 meters. The chassis and control system allows the typist to stop the movement of the film at any time and start it again, and if the recording is illegible, it can stop the machine, the film is automatically rewound and the typist listens to the desired recording location again. At the moment of film break, the device automatically stops. The tape recorder is designed for operation from a dynamic microphone, a receiver having an output voltage of 1.5 ... 5 V, and a telephone line. Quality indicators tape recorder type "C" (path recording-playback): uneven frequency response in the range 200 ... 4000 Hz - 13 dB. The noise level relative to the level at 100% modulation of the sound carrier -40 dB; harmonic coefficient at a frequency of 400 Hz - 5%; the speed of the film is 26 cm / s; continuous sound time of one full roll (1000 meters) 60 minutes. The tape recorder is powered from the 110/220 V alternating current network through a special autotransformer installed in the rectifier.