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The cassette player "Electronics-Microconcert-Stereo" has been produced since 1982 by the Zelenograd Precision Engineering Plant.
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The "Sony TCS-310" tape recorder became the prototype of the model.
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In 1982, the USSR did not have the necessary microcircuits and it did not work to make a full-fledged tape recorder.
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Collected it on "loose", transistors such as KT3129 / 3130.
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The devices of the first releases had a metal case, all subsequent ones - a plastic one.
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The model had a built-in electret microphone, which was used as a hearing aid, including simultaneously with the playback of cassettes.
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Later they developed the KF1407UD1 microcircuit, then the recording also got into the device, but it was already a tape recorder with the name "Electronics-331-stereo".
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Based on information from collection of Valery Khartchenko