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Since 1994, the Kvazar M-309S portable stereo tape recorder has been producing the Kalinin Leningrad Plant. The tape recorder is intended for recording mono and stereophonic phonograms and their reproduction by the built-in speakers or external controllers. There is a three-band equalizer, noise reduction device, LED indicators of the recording level, auto-stop, the ability to work with 2 types of tape and a number of other service devices. Universal power supply: from 220 V through an external power supply or from 6 A-373 elements. The detonation coefficient is ± 0.30%, the relative level of noise and interference in the З / В channel is -48 dB, the operating frequency range on the LV is 63 ... 12500 Hz, on its own speakers - 200 ... 10000 Hz. Maximum output power 2x2 watts.