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Radio constructor "Fon-7" from 1989 produced the Moscow plant "Elling". The set "Background-7" provides selection of a stereo signal and its filtering. This node is assembled on the K174XA14 (stereo decoder) and K174UN10A chips (filters). The use of MS made it possible to obtain very high performance characteristics: crosstalk attenuation between channels of 30 dB and suppression of the subcarrier frequency at the outputs of the channels of 50 dB. S / N ratio 50 dB. Current consumption 60 mA. Using the set together with the sets "Von-6", "Von-8", "Von-9", Von-10 "and" Von-11 ", you can assemble a high-quality stereo receiver.