Jupiter-kvadro 1975
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Amplifier "Jupiter-quad" from 1975 produced Lviv PO them. Lenin. The amplifier provides high-quality sound reproduction from one, two and four-channel sound signal sources. The amplifier operates in the following modes: mono, stereo, internal quadrophony (pseudo-quadrathon) and from a quad signal. In the "stereo" mode, channel pairs are combined, which increases the output power. The signal level is regulated separately and controlled by arrow indicators. Each channel provides electronic protection against overload. The amplifier comes with four remote speakers, but you can also connect stereo or quad headsets to it. The amplifier can work in a radio complex with household and professional equipment. Output power per channel: nominal 16, maximum 27W. The working frequency range is 30 ... 20000 Hz. Harmonic factor is not more than 1%. Ratio signal / background -56 dB. S / N ratio -60 dB. Transient attenuation between channels of at least 30 dB. The input impedance of the loudspeaker is 8 ohms. Supply voltage 127 or 220 V. Power consumption 290 watts. Dimensions of the amplifier 501x380x147 mm. Weight 15 kg. The price is 500 rubles. One speaker - 90 rubles. The amplifier "Jupiter-Quadro" was supposed to be used in the radio complex, where there was a four-channel tape recorder of the same name, but for several reasons, the main one of which was the absence of phonograms - the radio complex "Jupiter" did not receive distribution.
Documentation:
Information from collection of Valery Khartchenko