Progress 1957
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Since the beginning of 1957, the portable transistor radio receiver Progress has expertly produced the Voronezh Radio Works. '' Progress '' is the third domestic experimental experimental portable transistor radio. It is made on the basis of the radio "Surprise" and in its case. The radio is built on a superheterodyne circuit on seven transistors such as P402, P13A. It is designed to receive radio stations in the range of DV, ST. Radio reception is carried out on the internal magnetic antenna. The dimensions of the receiver 220x157x70 mm. Its mass with 1.3 kg batteries. Sensitivity 2 mV / m in the range of Far East and 1 mV / m in the range of SV. Selectivity on receive channels 20 dB. The nominal output power of an amplifier on a 0.5 GD-10 loudspeaker is about 200 mW. Range of effectively reproduced sound frequencies, not already 150 ... 4000 Hz. IF = 465 kHz. Power is supplied from two batteries "KBS-L-0.5", connected in series. The duration of continuous operation from a fresh set of batteries is about 60 hours. The body of the radio is made of special laminated wood and is pasted over with colored plastic. Manual assembly, just 300 receivers were assembled. In 1958, at the World Exhibition in Brussels, the radio was awarded a gold medal.
Information from collection of Valery Khartchenko