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The surround sound device "Dipton" has been produced since 1979. Lviv PO them. Lenin. "Dipton" can serve as an attachment to a tape recorder, an electronic telephone, a radio receiver, a radio receiver, a subscriber loudspeaker and other sources of monophonic signals. With the device, mono programs will acquire a new color, their sound will approach the stereo one. You can listen to the programs converted by "Dipton" through stereo phones or speakers of a stereo amplifier. Transistor "Dipton" reliable, compact, easy to handle. The price of the prefix is "‹"‹50 rubles (the initial 45 rubles). Sensitivity from a universal input of 250 mV, broadcasting 30 V. The harmonic factor is 0.5%. S / N ratio 60 dB. The phase shift between the output signals in the frequency band 20 ... 20000 Hz is 90 degrees. Since 1980, Ryazan Instrument Factory also produced a similar surround sound device, but it was called "Dipton-R" (Ryazan).