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Amplifier to the detector receiver "UDP-1" was produced in 1949 by the Omsk instrument-making plant them. Kozitsky. Amplifier "UDP-1" (Amplifier Detector Receiver 1 release) is designed to amplify the signals from the sockets of the phones of the detector receiver and allows you to get a loud-speaking reception, sufficient for the sound of small rooms. The amplifier is assembled on two 2K2M and SB-244 lamps and has 2 battery power supplies (2 and 80 V).