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Since 1926, the radio battery battery BCh has produced the Electrosvyaz trust, specifically the Leningrad Kozitsky plant and the Moselektrik plant in Moscow. '' CU '' was intended for the mass radio broadcasting of the country. Four-tube regenerative receiver 1-V-2 "warhead" is almost the same as the radio "BT", but with two levels of low-frequency amplification on transformers. When the phone is turned on parallel to the primary winding of the second transformer, it is possible to conduct reception on three lamps (BT circuit). The receiver is very difficult to manage - 9 controls. The big disadvantage is a common rheostat for all four lamps. It enables the reception of high-power stations at a distance of 700 ... 1000 kilometers to a Record-type loudspeaker. The radio covers the range of 340 ... 1800 meters and has a sensitivity of about 500 µV at maximum feedback and a selectivity of up to 20 dB. The leftmost knob adjusts the variometer to the frequency, the second is the communication switch with the antenna and the switch is a DV range, the third dual controls the feedback, the 4th is the rheostat of the heat. Power supply: 4 V, 50 and 160 V anode and 9 V grid. The price of the receiver is 100 rubles 62 kopecks.