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Since 1929, the low-frequency amplifiers UN-1 and UN-2 have been manufactured by the Moselektrik plant of the Electrosvyaz trust. Amplifier "UN-2" is designed to amplify the signal from the output of the detector or lamp (with headphone output) radio receiver and the maintenance of sufficiently large audiences using several loudspeakers. The amplifier "UN-1" is designed for individual service and audiences where high volume of received broadcasts is not required.