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Since 1971, the high-quality amplifier of the "Rainbow" woofer has been producing the Bryansk plant "Eleton". '' Rainbow '' is one of the first domestic high-quality LF amplifiers mastered in serial production. It is designed to amplify the signal from the electric organ, electric guitar, microphone, sound pickup and other sources of speech and music programs. In the ULF, it is possible to mix and amplify simultaneously 3 signals with separate volume control. Input 1 is designed to connect the electric organ, Input 2 sound pickups and electric guitars, and Input 3 for electric guitars and microphones. The sensitivity of the amplifier is 100, 60 and 10 mV. Rated power 16 watts with a load resistance of 3 ohms, maximum 25 watts. The band of reproduced sound frequencies is 30 ... 15000 Hz with non-uniformity of the frequency response at the edges of 1.5 dB. Nonlinear distortion factor of 2%. The background level is -60 dB. Adjust the tone of at least 18 dB. Mains power. At maximum power, the amplifier consumes 50 watts of power. Dimensions of the amplifier 340x265x93 mm. Weight 4 kg. The sound column ZK-24 consists of 6 loudspeakers 4ГД-28. Its rated power is 24 watts. Resistance at a frequency of 1000 Hz 3 Ohms, the operating frequency range of sound pressure 60 ... 12500 Hz. AC dimensions are 850x495x295 mm, weight is 18.5 kg. The amplifier was produced with a sound column of type ZK-24. During the release of the amplifier has undergone several upgrades of the electrical circuit.