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Radio with push-button setting "RSKN" (conditional name) was developed by IRPA in 1939. "РКСÐ" is a simple five-lamp, including a superheterodyne receiver receiver, with a button-type setting for a range of 200 ... 2000 m. Universal power supply, does not have AC or DC power and a power transformer. Anode voltage is obtained directly or through a rectifier, the heat of the lamps is connected in series.