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A professional high-quality single-track tape recorder "MEZ-2" has been produced, possibly since 1950, by the Moscow Experimental Plant. The tape recorder is designed to record speech and music in broadcasting, allowing you to record and play continuously for an unlimited time. The tape recorder has two independent channels (recording and playback) with two running gears, a switching and control system. Amplifying devices and rectifiers are located in two cabinets connected by an operator console. Each cabinet has an independent tape channel and consists of a running gear, a recording amplifier, a playback amplifier, and a rectifier. The running gear is assembled on a cast plate and consists of three motors (synchronous and two asynchronous), a removable block of magnetic heads, a keyboard for controlling the mechanism and rollers for pulling a magnetic film. Magnetic heads are installed on swinging platforms, which allow to adjust the position with the help of screws. All elements of switching, control and adjustment of audio frequency levels are concentrated on the operator"™s console. On the remote control installed input, output and transitional volume controls; measuring device for monitoring input and output levels; switching socket system; keys and signal lights. A two-stage recording amplifier with a transformer input and output is assembled on 2 6SJ7 lamps (6G8). On the chassis of the recording amplifier is an RF generator of currents for erasing and biasing. A three-stage reproduction amplifier (2 stages on 6SJ7 lamps (6ZH8 or 6ZH5) and the last on 6V6 (6P3S)) is assembled according to the amplifier circuit on resistances with feedback, corrective frequency response; input and output of the transformer amplifier. A rectifier provides power to the amplifier lamps. For auditory control, a high-quality control unit "KA-2" is attached to the tape recorder. Qualitative indicators of the device on films C or 1 (recording-reproduction path): The speed of pulling a magnetic tape is 77 cm / sec.The operating frequency range is 70 ... 7000 Hz. Detonation 0.15%. Time of continuous sound of a full roll of film (1000 m) 22 minutes; rewind time 1.5 minutes. Powered by AC 110 or 220 V, through an autotransformer. Power consumption is about 600 VA.