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The radio constructor "ULF-20 W" (low-frequency terminal amplifier) "‹"‹has been produced since 1982. RK is designed to build a mono PA for amplifying signals from a tape recorder, player and preamplifier. Rated output power, at a load of 4 ohms 20 watts. The range of frequencies, with uneven frequency response - 0.5 dB - 20 ... 20000 Hz. The rated input voltage is 1 V. The harmonic factor is 0.7%. The relative interference level is -70 dB.