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The transistor "Phoenix-002-quadro" network microphone from the 1st quarter of 1977 was experimentally produced by the Lvov Telegraph Equipment Plant. The USSR"™s first high-end quad-phono electric phone, Phoenix-002-Quadro, provides quad-reproduction of phonograms from external sources; psevdokvadrafonichesky reproduction of mono and stereo recordings from records and an external tape recorder; normal reproduction of mono and stereo recordings from EPU and tape recorder; dubbing of phonograms from gramophone records to a magnetic tape. The stereo 2-speed top-notch electric-playing device 0-ÐПУ-2С is equipped with a GZM-105 type magnetic head with a diamond needle. In order to reduce the detonation of sound in the EDA model, a massive disk is used, which is driven by a low-speed synchronous electric motor using an elastic belt. The engine is powered by a special amplifier with a master oscillator, whose frequency determines the rotational speed of the disc. The stroboscopic device and the adjustment knob make it possible to change the disc rotation speed within certain limits. EPU has a manual and automatic microlift, auto-stop and the pickup mechanism to its original position after playing the record. The four-channel amplifier of the microphone contains a four-channel preamplifier with separate tone control on the low and high frequencies. There is a device providing the effect of pseudo-quadrafony, a two-channel differential converter consisting of phase inverters and amplifiers. UM and BP as in "Phoenix-001-C". The phone is equipped with 2-way AC 20AS-5, each of which has 4 LF heads of type 4ГД-43 and 2 HF heads of ЗГД-31. You can listen to recordings on quad and stereo phones. Rated output power at a harmonic ratio of 1% - 4x15 watts. The nominal operating frequency range for sound pressure with frequency response unevenness ± 6 dB - 63 ... 18000 Hz. Knock factor ± 0.15%. The level of interference from vibration -60 dB. Power consumption 180 watts.Electrophone dimensions are 640x460x210 mm. One speaker 440x315x255 mm. Electron mass 30 kg, one speaker 10 kg.