4NBS-6 1938
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Radio battery "4NBS-6" from 1938 produced the Voronezh plant "Electrosignal". Superheterodyne receiver '' 4NBS-6 '' - which stands for 4-lamp, Normal, Battery, Superheterodyne, 6th model, assembled on four small lamps: SB-242, CO-241 (2), SB-244 . Power battery, from two dry batteries, 100 V anode and 2 V filament. The power of the anode is 8 mA, the power is 600 mA. The ranges of received waves: DV - 715 ... 2000 meters, NE 190 ... 580 meters. Sensitivity not less than 500 mV, selectivity in the adjacent channel is about 20 dB. IF 460 kHz. Rated output power 150 mW. Frequency range 200 ... 2500 Hz. The case is wooden, covered with varnish. Left knob - power on, then the volume, ranges, above - setting.
Documentation:
Information from collection of Valery Khartchenko