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The ARZ-40 mains lamp radio was developed in 1940 by the Alexander Radio Plant No. 3. The radio did not go into the series for several technical reasons. Only about ten copies were made. The ARZ-40 radio receiver is designed to receive five local, pre-tuned fixed radio stations in the Far East and North bands. The receiver is assembled on four radio tubes according to the direct amplification scheme. Powered by 110, 127 or 220 volts. The sensitivity of the receiver does not exceed 3000 mV. Rated output power 0.2 watts. The range of reproducible sound frequencies 200 ... 5000 Hz. The receiver dimensions are 247x192x110 mm. Weight - 3.2 kg. Power consumption 10 watts. The receiver has a volume control. Turning on the receiver occurs when pressing any of the buttons of the fixed settings, turning off by pressing the last button. Above the fifth button is a neon light to indicate power.