Network tube radio receiver '' 5NR-3 ''.
Tube radios.DomesticThe network tube radio receiver "5NR-3" has been produced since 1937 by the Leningrad Plant named after V.I. Kazitsky. The 5NR-3 radio receiver is built according to the 1-V-2 direct amplification scheme + rectifier, assembled on 5 lamps with 4-volt lamp heating: SO-124 (2), SO-118, UO-104 + rectifier on lamp VO-116. The ranges of the received waves are DV 750 ... 1920 m and SV 230 ... 575 m. The sensitivity and selectivity depended on the position of the feedback control knob. Minimum indicators of sensitivity and selectivity: 20 mV / m and 8 dB, maximum 500 μV and 30 dB. Maximum output power 1 W. Audio frequency range at minimum feedback 200 ... 5000 Hz. The receiver is assembled in a wooden lacquered case. The backlit scale is graduated in UE. The left knob is plugged into the network and the volume control, then the range switch, a little higher is the setting, then the feedback control and the tone (timbre) control.
