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From I-kv 1971, the transistor radio Signal-601 produced the Kamensk-Ural instrument-making plant. A portable transistor radio receiver of the 4th class "Signal-601" with a mechanical clock, which includes a radio receiver at a specified time, is based on the previous receiver "Signal". The new radio receiver is a DV and CB superheterodyne powered by a Krone battery. From the base, the radio is different new design and minor changes in the electrical circuit. Sensitivity in the ranges: DV - 1.5, SV - 0.8 mV / m. 26 dB selectivity. Rated output power 100 mW. The range of sound frequencies reproduced by the speaker 0,25GD-10 is not already 450 ... 3000 Hz. The dimensions of the receiver are 135x85x43 mm, weight 400 g. Comes with a leather carrying case. The receiver was exported to a number of countries.