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The transistor "Shkolny-Stereo" network transistor microphone has been producing the Grozny RTZ since the beginning of 1985. Stereophonic electrophone 3 groups of complexity "School-stereo" is intended for playing back sound recordings from records of all formats, amplifying external signals and recording from records to a tape recorder. Rated output power 2x3 watts. The range of reproducible frequencies by voltage, with non-uniformity 3 dB - 56 ... 14000 Hz. Harmonic coefficient at rated power 2.5%. Transient attenuation between channels 35 dB. Maximum power UZCH limited harmonics 10% - 10 watts. The background level is -50 dB. The timbre adjustment range is ± 10 dB. The limits for adjusting the stereo balance are 8 dB. Powered by a 220V mains electrophone. Power consumption 40 watts. The weight of the phone is 8.5 kg, one speaker 4 kg. Dimensions of the model 420x370x165 mm, AC 250x220x360 mm. To increase the range of the plant produced the same in design, electrical circuit and design such electrophones as: "School EF-301S", "School EF-302S", "School EF-302S-1", "Sintar EF-302S" and "Sintar EF -302S-1 ".