P-5 1924
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Since August 1924, the P-5 detector radio receiver produced the Nizhny Novgorod Telecommunications Plant named after Lenin of the Electrosvyaz Trust. The receiver is built according to a simple scheme. The adjustment is made using a variometer of cylindrical self-induction coils and a sectioned coil (contact switch). Detector coupling changes irregularly (contact switch). There are three terminals for "long and short wave" operation. The receiver is easy to manage. It can be used when there is some interference from other radio stations, as it has low selectivity (slightly higher than that of P4). Suitable in village and suburban detector installations. It is assembled in a wooden box painted black, with polished or painted top cover. The range of received waves from 350 to 1800 meters. The radio works on high-resistance handsets. Dimensions 230x150x70 mm, weight 900 grams. The price of the receiver is 10 rubles 89 kopecks.
Based on information from collection of Valery Khartchenko