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Electromusical instrument "Estradin-7" (Tuning fork) was produced since 1972. It has a 6 octave keyboard, 7 octave pitch range, frequency vibrato, registers: 5 formant timbres 16 ", 3 timbres 8", 2 timbres 4 ", effects - string, tutti, tremolo, dulcimer, vibraphone, reverb, manual and pedal (contactless) volume control. Power supply voltage is 127/220 volts. Weight is 50 kg. EMP dimensions are 1000x800x440 mm.