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Radio receiver network radio "MS-539" since 1939 produced the Alexander Plant No. 3 NCC. By the XVIII Congress of the CPSU (b), which opened on March 10, 1939, the MC-539 radio receiver was developed and released by an experimental series (Small Super-heterodyne, 5 years old, 39 years old). Radio frequency bands: DV - 150 ... 400 KHz. SV - 540 ... 1500 KHz. HF - 6 ... 18 MHz. The sensitivity on the ranges of DW and CB 300 µV, KV 500 µV. The adjacent channel selectivity is 20 dB. Nominal loudspeaker output power, with 1W bias. The model used the ARG system. Powered by AC 110, 127 or 220 V. Power consumption 50 watts. From the middle of 1939, the release of the radio receiver continued in series and ended in the middle of 1941.