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The MDS-2 tape recorder was supposedly developed in 1950 at the Moscow Experimental Plant for subsequent release. Dictational tape recorder "MDS-2" is designed for long-term recording of telephone conversations, reports, dispatch orders and other speech programs on a magnetic tape with subsequent playback. The use of the MDS-2 tape recorder in institutions will speed up the process of transcribing various reports and speeches and increase accuracy in transcribing. The tape recorder is made in the form of a console, in which a single-motor tape drive mechanism is located, an amplifying device and an automation system. The MDS-2 tape recorder can be controlled from the console or with the foot control. For recording presentations and lectures, a portable dynamic microphone is attached to the tape recorder. The tape recorder "MDS-2" is equipped with an original device for starting and stopping the tape drive mechanism. The use of this device allows you to fully automate the process of recording. When a signal appears at the input of the amplifier, the tape recorder is switched on for recording and 10 seconds after the end of the transmission, it stops itself. With the help of the same device dictation of the recorded text is carried out; the tape recorder automatically dictates the recorded speech in short semantic groups of words, almost the same as a man would dictate. If necessary, any dictated group of words can be repeated. Thanks to automation, work on a tape recorder after installing a magnetic tape is reduced only to pressing a foot pedal or a control key. The "MDS-2" tape recorder has the following electrical and exlocation data: pass-through frequency response recording-playback in the range 200 ... 3500 Hz with irregularities from 2 to 5 dB The harmonic coefficient is not more than 3.5% at a frequency of 400 Hz with 100% modulation of the sound carrier. Self-noise level minus 35 dB. Speed "‹"‹of advance of a tape is 192,5 mm / sec. Duration of one roll is 60 minutes. Rollback rewind time 3 minutes.The tape recorder is powered by 110, 127 and 220 V AC mains. Power consumed from the mains is 125 W. The amplifier of the tape recorder is equipped with an automatic gain control when recording, which allows for a change in the input level from minus 5 to plus 20 dB.