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Since 1971, the portable radio receiver "Selga-403" has been expertly manufactured by the Riga Plant named after A.Popov. A class IV radio receiver, "Selga-403", is designed to receive radio stations in the Far East and Main bands. Reception is conducted on the internal magnetic antenna, but it is possible to connect an external antenna. Headphones can be connected to the receiver. The receiver is made of a superheterodyne circuit on three transistors and an integrated circuit "Rhythm-2" / 2KZHA-421 / (some copies had a chip "Rhythm-1"). The circuit of the input circuit and converter is similar to the circuit of the "Selga-402" receiver, with the difference that in order to improve the selectivity of the reception in the DV coil, the RC filter is turned on. The IF path, the detector and the pre-amplification stages are made on a single integrated circuit containing 6 transistors, 22 resistances and 7 capacitors. The output stage of the woofer amplifier is made on KT315A transistors using a push-pull transformer circuit. In comparison with other receivers, the printed circuit board is reduced here due to the use of a chip measuring 26x22x13 mm. The use of a 0.5GD-21 loudspeaker improved the acoustic parameters and increased the output power up to 220 mW. Power supply from 6 elements 316. The receiver dimensions are 195x95x50 mm, weight is 650 g. In total, 273 receivers were released, after which it was removed from the conveyor and the release of the Selga-402 receiver continued.