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A low-frequency preamplifier, UP-8/1, was planned for release in 1933 by plant No. 2 of NUPP NKPT. The amplifier UP-8/1 is designed for radio broadcasting nodes with the number of radio points up to 200, it has preliminary and terminal cascades and gives the power up to 8 W to the load. The amplifier is powered by batteries, a two-collector dynamo or a V-8/1 rectifier. The amplifier can be mounted on a table or suspended from a wall. The device has a volume control. The model preamplifier is assembled on 3 radio tubes of the CO-118 type, and the final one according to the "push-bullets" scheme on 6 radio tubes of the UO-104 type.