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The prefix three-program "Rainbow" was produced since 1981. The prefix works in conjunction with a subscriber loudspeaker in a three-program wire broadcasting network. Programs are selected with a push button switch. In the PT there is an adjustment of the sensitivity of the channels of the 2nd and 3rd programs. The sensitivity of HF channels is 0.25 V. The nominal output power is 250 mW. The range of reproduced sound frequencies at the output of the console is 100 ... 6300 Hz. Power consumption 2 watts.