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The UH-6 preliminary low frequency amplifier has been manufactured since 1933 and was manufactured by plant No. 2 of NUPP NKPT. The UP-6 amplifier is an upgrade of the previous UP-3 and UP-3N amplifiers, but without terminal cascades. The amplifier is assembled on 3 radio tubes and is designed to pre-amplify signals from a receiver or microphone and build up powerful termination amplifiers of radio nodes.