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The tape recorder "MEZ-3" in 1950 was developed and released in a limited series by the Moscow Experimental Plant. The transportable one-track tape recorder "MEZ-3" is a reportage one and is intended for recording speech or simple music programs. The tape recorder consists of three blocks, a tape drive mechanism, an amplifier and a rectifier with a compartment for wires and auxiliary equipment. Engine one, type TWO-U3. LSM with vertical (one above the other) arrangement of the coils. The applied magnetic tape of type C or 1 which is reeled up on coils or lugs on 500 meters. The speed of pulling the magnetic tape 77 cm / sec. Detonation 0.2%. The power consumption of 60 watts from the network. The time of recording or playing soundtracks on one track is 22 minutes. The operating frequency range is 100 ... 6000 Hz. Includes microphone type SDM. There are two microphones at the same time. The applied radio tubes 6Zh8 (2), 6N9S (1), 6Zh3 (3), 5TS4S (1). The nominal output power on a 2GD-3 loudspeaker is 1 watt. Recording and playback amplifiers are separate. On the tape recorder it is possible to reproduce phonograms recorded on other tape recorders with the same speed.