Radio constructor `` Orpheus-Stereo '' (Stereophonic amplifier of low frequency).
Radio and electrical constructors, sets.Audio AmplifiersThe radio designer "Orpheus-Stereo" (Stereophonic LF amplifier) has been produced since 1984. The set contains manufactured and adjusted units (stereophonic PA, preamplifiers with timbre blocks, rectifier with filter capacitors), as well as input and output connectors of the SG type. The stereo amplifier has the following technical characteristics: Nominal frequency range, with frequency response unevenness no more than 2 dB 20 ... 20000 Hz. Input resistance 1 42 kOhm, 2 100 kOhm. Voltage of input 1 65 mV, input 2 185 mV. The limits of tone control, at frequencies of 35 Hz and 20,000 Hz -13 and 10 dB. To power the PA, a bipolar power supply unit with a voltage of ± 18 ... 23 V is required, and the preliminary stages and a timbre block are 18 V. The set goes on sale with nodes adjusted at a supply voltage of 18 V. The maximum output power of the amplifier depends on the supply voltage and load resistance. With a supply voltage of 18 V, it is 24 W (4 ohms) and 12 W (8 ohms). With a supply voltage of 23 V, the maximum output power increases to 45 and 30 W, respectively. Amplifiers of the "Orpheus-stereo" set are assembled on bipolar transistors. KT803A transistors are used in the output stages. The price of the radio designer is 50 rubles.
