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Radio constructor "Start-7173" (ULF preliminary) since 1984 was produced by the Kamenets-Podolsk plant "Elektropribor". RC allows to assemble a stereo low-frequency preamplifier from parts on a printed circuit board, designed to work in the paths of high-quality audio reproducing devices. It can be connected to the input of any power amplifier with a sensitivity of 0.5-1V with an input resistance of at least 10 kΩ. The amplifier has two identical channels. The range of operating frequencies, with non-uniformity of 1.5 dB - 20 ... 20000 Hz. Nonlinear distortion coefficient, with U out. = 1V, no more: at a frequency of 200 Hz - 0.05%, at a frequency of 5000 Hz - 0.05%, at a frequency of 16000 Hz - 0.05%. Sensitivity, with U out. = 1V: pickup 250 mV, radio - 20 mV, microphone - 3 mV. Noise level, not worse than -65 dB. The depth of tone adjustment at a frequency of 40 Hz ± 12 dB, at a frequency of 16 kHz ± 12 dB. The supply voltage is 12 ... 18 V. The dimensions of the amplifier are 92x167x35 mm. Weight 150 gr.