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Aviation radio "US-9" (Nightingale) was produced since 1947. Created on the basis of the American receiver "BC-348" and is practically a copy of it. In the receiver, 9 lamps of the series are used: 6K7, 6Zh7, 6Zh8, 6F7, 6B8, 6P6S. The ranges are 200 ... 500 kHz and 1.5 ... 18 MHz. Sensitivity 3 ... 8 µV (telegraph), 5 ... 15 µV (AM). The intermediate frequency is 915 kHz. Powered by the on-board network, either DC 27 V, or AC 115 V, 400 Hz through the built-in mapper. Power consumption 35 watts. Dimensions of the receiver 245x460x275 mm. Weight 18 kg.