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From the first quarter of 1970, the transistor portable "Leader-302" and "Rogneda-302" electrophones were manufactured by the Saratov Precision Electromechanics Plant, subsequently the Korpus software. Portable class 3 "Leader-302" and "Rogned-302" electrophones are designed for semi-automatic playback of records, 175 mm in diameter in the hospital and with moderate movement. Consist of electric player and bass amplifier on transistors. The amplifier has a sensitivity of 250 mV, rated output power 0.5 watts. A 1GD-28 type loudspeaker is used in electrophones. The band of reproduced sound frequencies is 150 ... 7000 Hz. The DRV-0.1 engine used in the old model of the Rogned electrophone is replaced by a new DLF-1. Disk rotation speed of 33 rpm. The power of the electrophones is from 6 elements A-373, the power consumption does not exceed 2 watts. Electrophone dimensions - 316x288x104 mm, weight - 2.7 kg. The design, electrical circuit and appearance of the models are the same. In 2 titles, electrophones were manufactured to expand the product range.