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Since 1937, the Leningrad Zavod Plant named after Lukhovsky Plant has produced a radio network lamp "5NR-3". Kazitsky. Radio "5ÐÐ -3" is built according to the direct amplification 1-V-2 rectifier, assembled on 5 lamps with 4 volt filament lamps: CO-124 (2), CO-118, UO-104 rectifier on the VO lamp -116. The ranges of received waves are DV 750 ... 1920 m and CB 230 ... 575 m. Sensitivity and selectivity depended on the position of the feedback control knob. Minimum sensitivity and selectivity: 20 mV / m and 8 dB, maximum 500 µV and 30 dB. Maximum output power 1 watt. The range of sound frequencies with a minimum feedback of 200 ... 5000 Hz. The receiver is assembled in a lacquered wooden case. Scale with illuminated graduated at UE. The left knob is turned on in the network and the volume control, then the range switch, a little higher - the setting, then the feedback control and tone control (tone).