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The "Iskra" battery-operated radio receiver was developed and experimentally released at the Alexander Radio Factory at the end of 1949, and has been massively produced since 1950. Designers of the Sverdlovsk plant of automatics participated in the development of the receiver. The basis was the serial receiver ARZ-49. '' Iskra '' is one of the mass battery receivers. This is a four-lamp superheterodyne on palsokovyh lamps. Ranges: DV 2000 ... 730 m and CB 580 ... 188 m. Sensitivity 400 µV. IF 110 kHz. Output power on a 1GD-2 loudspeaker is 150 mW. Frequency range 200 ... 3000 Hz. For power supply, special battery kits are used. The main set for 1000 hours of operation with a BNS-MVD-400 filament battery, two GSD-60S-8 anode-grid batteries and a lightweight, for 300 hours, BNS-MVD-95 heater-type batteries and two 5SG-60S anode-grid batteries 2.5 Lamps can operate with significant deviations of the filament voltage from the nominal 1.2 volts. Two 60 V anode batteries each have taps of 45 V and are connected in series. Anode voltage 90 c. Therefore, first, the batteries include sections for 45 V, and then as they are consumed, first connect one and then another section. The radio has a power cable with chips that are included in the battery sockets. Sections are connected by swapping chips. The circuit automatically adjusts the anode current of the ULF, depending on the volume of work. Below the scale is the range selector lever. Left knob - volume control and power switch. Right - tuning to the radio station. Sheet of pressed sheet steel. The dimensions of the receiver are 214x260x148 mm, its weight is 4.3 kg.