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Radio Orpheus-Stereo (Stereo LF Amplifier) "‹"‹has been produced since 1984. The set contains manufactured and adjusted nodes (stereo PA, preamps with timbre, rectifier with filter capacitors), as well as input and output connectors such as SG. The stereo amplifier has the following technical characteristics: Nominal frequency range, with uneven frequency response not more than 2 dB 20 ... 20000 Hz. Input resistance is 1 42 kΩ, 2 100 kΩ. Input voltage 1 65 mV, input 2 185 mV. The limits of tone control at 35 Hz and 20 000 Hz -13 and 10 dB. To power the PA, a bipolar power supply of ± 18 ... 23 V is required, while preliminary cascades and a 18 V timbre are needed. At a supply voltage of 18 V, it is 24 W (4 Ohms) and 12 W (8 Ohms). At a supply voltage of 23 V, the maximum output power increases to 45 and 30 W, respectively. Amplifiers of the set "Orpheus-stereo" are assembled on bipolar transistors. In the output stages used transistors KT803A. The price of a radio designer is 50 rubles.