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The professional tape recorder "MEZ-1" was produced presumably since 1949 by the Moscow Experimental Plant (MEZ). The tape recorder is designed to operate from a dynamic microphone, sound pickup or a 1.5-volt line with a resistance of 600 ohms. The tape recorder kit consists of six separate packages, which are interconnected by special shielded detachable hoses. The power consumed by the tape recorder from the AC network does not exceed 300 W; Duration of continuous sound about 22 minutes. The qualitative indicators of the MEZ-1 tape recorder when using a type "C" film (recording-reproduction path) are the following: the unevenness of the frequency response in the range from 50 to 10,000 Hz does not exceed 11.5 dB; the harmonic coefficient measured at a frequency of 400 Hz with 100% modulation of the carrier 1.5%; the level of intrinsic noise relative to the nominal output level at 100% modulation of the audio carrier is -48 dB; the constancy of the speed of the undercarriage is 0.3% at a speed of pulling the film 77 cm / sec.