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The radio battery "RPK-9" from 1938 produced the Leningrad plant "Radioman". '' RPK-9 '' - Radio Receiver Kolkhoz, 9th version. Receiver for individual use with battery power, designed to work in rural areas and in places with no electrical network. The wavelength range of 200 ... 600 and 725 ... 1900 meters is divided into two sub-ranges, CB and DV. In the radio there is the possibility of working on two and one lamp or with a crystal detector. This is done by appropriate switching. The receiver is mounted on a metal chassis. Lamps, coils and a capacitor bank are located on the upper side of the chassis; transformers and installation are placed at the bottom. The scheme, the location of parts and the overall arrangement of the elements are similar to the base radio "BI-234", but a number of structural details are somewhat different. There are four knobs for control: tuning knob, glow resistor, feedback adjustment and range switch. All pens are displayed on the front panel. On the back of the chassis are the antenna, ground, loudspeaker and mode switching jacks, besides the sockets for working on one, two or three lamps, and also for working with a crystal detector. A power cord with pads is also inserted through the back wall. The receiver's case is closed at the back by a removable plywood wall, on which there is a sticker indicating the purpose of the sockets, and on the other hand is a diagram.