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A portable transistor radio "Gauja" from I quarter of 1961 produced the Riga Radio Factory named after AS. Popov. The compact radio "Gauja" (Gauja or Gauja is a river in Latvia) is one of the first, among the few other transistor portable radios produced by domestic (USSR) radio industry in large enough series in the late fifties and also in the early sixties of the twentieth century. The Gauja radio (Gauja) is a dual-band superheterodyne on six transistors of types P401 and P15, powered by a Kron battery or a 7D-0.12 battery. The radio "Gauja" works in a DV range of 50 ... 408 kHz and a wave band of 520..1600 kHz. Reception of broadcasting radio stations is made on the internal magnetic antenna. The sensitivity of the receiver on long waves is 4.0 mV / m, on average 2.5 mV / m. The adjacent channel selectivity is 16 dB. Maximum output power 150 mW. Band of reproducible frequencies 400 ... 3000 Hz. Action AGC - 16 dB. IF 465 kHz. A quiescent current of 6 mA, operation is maintained when the supply voltage drops to 5.6 volts. Duration of work at an average volume from the battery 40 hours, the battery 15 hours. The dimensions of the case are 162x98x39 mm. Receiver weight with battery and leather case 600 gr. The case is made of colored polystyrene plastic in two colors, and the case is made of artificial leather. Installation of the radio "Gauja" is made by printing on the foil getinakse. The price of a radio receiver with a Krone-type battery is 43 rubles 70 kopecks, and a 7D-0.12 type battery is 52 rubles 90 kopecks.