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The Vilma-311 stereo[1] is a Soviet stationary stereo cassette recorder with two speakers that uses 3.81 mm tape. [2] It was mass-produced at the Vilma Instrument-Making Plant in Vilnius from January 1975 to December 1985. [3] Since 1983, it has been the only recorder produced at that time and the very last recorder in the SM-14 series. It is almost identical to the Tonika-310 stereo recorder. Frequency range: 40 Hz – 12.5 kHz. Peak power: 4 W. Power consumption: 40 W. Wow and flutter coefficient: 0.3%.

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