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The radio battery-type "BSH" from 1927 produced the Leningrad Kozitsky plant. BSH is a broadcasting receiver of direct amplification of the construction of Ing. Borusewicz, six-lamp). It operates in the range of 300 ... 1800 m (1000 ... 167 kHz). Reception can be conducted on an open or loop antenna. Power supply from DC sources. The receiver has two high-frequency gain stages, a lamp detector and two low-frequency gain stages, and two lamps can be switched on in the last stage. To reduce the RF gain, the first RF gain stage can be turned off. All receiver cascades are designed for operation with PT-2 lamps. A telephone or loudspeaker is included in the anode circuit of the first or second stage of the LF amplification, depending on the strength of the received signals. The receiver has 4 resonant circuits. The range of radio waves is divided into two parts, these are 300 ... 800 m and 700 ... 1800 m. To work on each part using a common switch, separate variometers for tuning the antenna and separate loop coils are included. All circuits, except for the antenna, are tuned using variable capacitance co-sensors, rotated by individual limbs. Bass boost on transformers. To power the radio, you need a 4 V battery and an anode 80 V battery.