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Electro-acoustic unit "VEF" since 1971 produced the Riga factory "Vef". The electro-acoustic unit consists of a low-frequency amplifier operating on two dynamic heads of the 4ГД5 and 2ГДЗ types with a voice coil resistance of 8 and 12.5 ohms. The unit "VEF" is intended for amplification of electrical sound signals of adapters, portable receivers, tape recorders. Rated output power 3 watts, maximum 6 watts. Sensitivity from the input of the radio receiver 10 mV, sound pickup and tape recorder 250 mV. The frequency range of the electrical path is 80 ... 12500 Hz, with non-uniformity of the frequency response - 14 dB, timbre adjustment range for high and low frequencies - 12 dB. The unit is powered by AC power. Power consumption 45 watts. The unit has a 9 V voltage regulator to power portable receivers with a load current of up to 100 mA. The dimensions of the unit - 205x235x580 mm, weight 10 kg.