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Radio receivers "Sokol-M" and "Sokol-403" were produced from 1970 and 1971 by the Moscow Radio Plant. The Sokol-M radio receiver was created on the basis of the Sokol receiver and operates in the LW and MW bands. Sensitivity 3 mV/m and 1 mV/m. Selectivity 20 dB. Its circuit is almost similar to the circuit of the Sokol receiver, only the P-422 high-frequency transistors are replaced by GT-309, and the low-frequency P-14 and P-15 by GT-108. The parameters of the radio receiver have changed little, and its nominal output power has decreased to 50 mW, respectively, the battery life of Krona-VTs has increased to 100 hours. The design of the receiver was similar to that of the Sokol-403 receiver, produced since 1971. The ''Sokol-403'' radio receiver operates in the LW and MW bands. Reception is made on an internal magnetic or external antenna. The receiver kit includes a charger that provides battery charging without removing it. The dimensions of the receiver are 157 x 92 x 30mm. Weight 400 gr. Leather case included. The radio was produced until 1982. A radio receiver was also produced for export with several names. A set of parts and assemblies for self-assembly of the receiver was also produced.