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Surround sound device "Dipton" was produced since 1979 by Lviv software named after Lenin. "Dipton" can serve as a prefix to a tape recorder, electric microphone, radio, radio, subscriber loudspeaker and other sources of monophonic signals. With the device, monophonic programs will acquire a new color, their sound will approach stereo. Converted by "Dipton" programs can be listened to through stereo phones or speaker stereo amplifier. Transistor Dipton is reliable, compact, easy to use. The prefix price is 50 rubles (initial 45 rubles). Sensitivity from a universal input 250 mV, broadcast 30 V. Harmonic coefficient of 0.5%. Signal to noise ratio 60 dB. The phase shift between the signals at the output in the frequency band of 20 ... 20,000 Hz is 90 degrees. Since 1980, the Ryazan Instrument Plant has also produced a similar surround sound device, but it was called "Dipton-R" (Ryazan).