Radiotekhnika U-7112S 1989
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Amplifier full "Radio engineering U-7112-stereo" since 1989 has produced the Riga software "Radio engineering". The amplifier is intended for amplification, operational control and switching of low-frequency signals when working as part of a set of consumer radio equipment. The amplifier consists of 2 independent amplification channels with a common power source. The amplifier has a protection circuit that prevents damage due to overheating, power overload and short circuit in the load. The parallel connection of several transistors, ensuring their low load factor and advanced protection circuit guarantee high reliability of the amplifier. Electronic switching of input signals and electronic control of this switching allow for the operational selection of program sources. The amplifier provides: Ability to connect 4 sources of signals: electric player, tuner and two tape recorders. The ability to connect two pairs of speakers and stereo phones. The ability to listen to the signal in "stereo" or "mono". The possibility of loudness at low volume levels and stepwise decrease in volume. The ability to limit the range of effectively reproducible frequencies. The ability to adjust the timbres at low and high frequencies. The possibility of rewriting from one tape recorder to another and simultaneous recording on both tape recorders. The possibility of operational control of the recording in the presence of a tape recorder with separate recording and playback heads. The ability to simultaneously turn on (the power button) the power supply voltage of the amplifier and the "network outlet" (disconnecting) of the signal sources connected to the sockets. Indication on (glow indicator of the priority input). Indication of the connected input and overload for each channel. Main technical characteristics: The nominal output power of each amplifier channel at a load resistance of 8 ohms - 35 watts. The maximum output power of each amplifier channel at a load resistance of 8 ohms is 50 watts. The peak musical power of each amplifier channel at a load resistance of 8 ohms is 110 watts.The output power for connecting stereo phones is 95 mW. Average power consumption not more than 85 watts. The rated voltage of the amplifier is 220 V. The nominal input voltage for the line inputs / for the correction input is 500 mV / 5 mV. The minimum input voltage for the line inputs / for the corrective input is 150 ... 200 mV / 1 ... 2 mV. The range of reproducible frequencies with non-uniformity of the frequency response ± 3 dB is no longer 10 ... 30000 Hz. Deviations of the frequency response in the range of sound frequencies 20 ... 20000 Hz relative to the signal level at f = 1000 Hz for linear inputs / for a correction input no more than ± 1.0 dB / ± 1.5 dB The harmonic coefficient in the frequency range of 40 ... 16000 Hz is not more than 0.2%. Signal / weighted noise ratio for line inputs / for a correction input of at least 76 dB / 66 dB. The overall dimensions of the amplifier - 431х360х72 mm, weight - 6.5 kg.
Information from collection of Valery Khartchenko