FIELD: television. SUBSTANCE: for amplifying high frequencies, switches of television channels are provided with input stages with MOS tetrodes for each range of tuning unit. Change-over of two ranges is effected by connecting both input amplifiers across output terminal connected to reference potential terminal of control voltage generator as well as by intercoupling between two input amplifiers depending on switching position of output terminal and on circumstances in which only one output stage will be activated. EFFECT: improved design. 4 cl, 2 dwg
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