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Since 1972, the Stereophonic amplifier Electron-20 produced the Murom RIP plant. The amplifier is made in the form of 3 independent blocks and is designed to work from any source of audio signal. Rated output power 2x10 W, with SOI 2%. Maximum output power 2x15 watts. Output resistance 8 ohm. Sensitivity from the input of the sound pickup, radio, TV and tape recorder 0,2 v, microphone 10, electric guitar 20 mV. Dynamic range of 80 dB. The frequency range at the amplifier output is 40 ... 15000 Hz, with uneven frequency response ± 1.5 dB. The depth of the tone control on the borders of the range ± 12 dB. The coefficient of the transient attenuation of 40 dB. Depth adjustment level 50 dB. The limits for adjusting the stereo balance are 8 dB. Speakers have two 4GD-28 loudspeakers and two 1GD-28 each. The resistance of each speaker is 8 ohms, the maximum input power is 18 W, the reproducible frequency range for sound pressure is 80 ... 13000 Hz. The amplifier is powered by 127 or 220 volts, consuming 60 watts of power. The dimensions of the amplifier 425x295x148 mm, weight 10 kg. The dimensions of one speaker are 375x162x517 mm, weight 4.5 kg.