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The radio battery "PL-1" since 1928 produced the Moscow plant "Moselektrik". "PL-1" stands for: Receiver, Lamp, 1-lamp. "PL-1" is a regenerative receiver, assembled according to a simple scheme 0-V-0 in a small polished wooden box. The wavelength range of the radio is from 300 to 1700 meters. The antenna is adjusted with a variometer, equipped with a folding vernier and fixed capacitors, switched using a contact switch. Feedback is set using the communication variometer. It enables the reception of local or nearby stations in the presence of small noise on the loudspeaker (Liliput, Record) and some distant ones on the headset. The receiver in the absence of power or a faulty lamp can be used as a detector. Price receiver 35 rubles.