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From 1935 to 1939, the network lamp lamp SI-235 was manufactured by the Ordzhonikidze Moscow Plant and from 1936 to 1941 and by the Voronezh Plant Elektrosignal. SI-235 (Network Individual 2-circuit, 3-tube, sample of 1935) is a new mass network cheap receiver for a city radio listener and assembled according to the 1-V-1 regenerator circuit with parallel power supply and differs little from the BI-234 receiver circuit. . The new radio is decorated in a box with a dynamic loudspeaker, it has sockets for a turntable and a dial. The SI-235 receiver has ended the era of direct amplification receivers. "BI-234" and "SI-235" were the first receivers, the production of which was put on the conveyor. With the release of these mass receivers, a new stage has begun in the radio industry: the development of in-line methods for the production of radio equipment and a new, more modern technology. Due to its simplicity and low cost, the receiver quickly gained popularity among the population. Built receiver on 4 lamps; CO-148, CO-124, CO-122, BO-230 or BO-202 and adjustable feedback. UHF on the CO-148 lamp has a capacitive coupling to the antenna, the CO-124 lamp is a detector. ULF is made on pentode CO-122. Anode and screen circuits of the receiver lamps are powered by a half-wave rectifier on the V-230 cenotron. The capacitor tuning to the frequency - two-piece, with a dielectric made of cellulose. The receiver is designed to receive radio stations operating in the Far East - 714 ... 2000 meters and CB - 200 ... 545 meters. The rated output power of the amplifier is 0.6 watts. Power consumption from 110, 127 or 220 volts - 40 watts. Dimensions of the model 340x420x215mm. The receiver is assembled in a case of multi-layer plywood, with textured surface finish under shagreen. Removing the rear wall disconnects the mains voltage. Lamps are separated by two shielded compartments, in the left are the low-pass lamps CO-124 and CO-122, in the right RF CO-148. Kenotron - VO-230 is located on the power transformer. Switching the mains voltage by jumpers.There are adapter slots on the chassis (in models since 1938), as well as antenna and ground jacks. Front located controls. In the center is the setting knob. Left lower knob - volume control, combined with a switch. Right knob - feedback. Between them the lever of the range switch "Cor and Dl" (MW and LW). In the window size of 25x30 mm visible illuminated vertical rotating scale. Near the scale is the trim lever trimmer lever. Here, below the scale below, there is an emblem with the inscription: '' General Directorate for Low-Current Industry ''. A loudspeaker with bias, on it is the output transformer. The price of the receiver is 250 rubles (1935). For example, travel on the subway in those years was equal to 30 kopecks. During the Second World War, all receivers held by the population were deposited by the state, some photographs contain information from this time.