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The electronic accordion "Estradin-8B" since 1971 has produced the Zhytomyr plant "Elektroizmeritel". The button accordion is built on the basis of the usual mechanical button accordion, which has 61 keys and 120 bass buttons and ready-made chords. The bayan, in which reed resonators are preserved, is electrically connected to the electronic unit and acoustic units. Saving the property of a common accordion allows you to save the technique of playing on it and use the appropriate musical literature for teaching and performing works of various genres. In addition, it is possible to alternate and joint sound of electronic and ordinary voices. Registers, timbres, the nature of the amplitude envelope of the sound and other effects are located on the electronic unit, and some of the most frequently used controls are placed directly on the button accordion. The bayan has: a basic tonal range of 6.3 octaves (from the counter-octave fa to a fourth-octave salt); 5 octave registers in the right keyboard and 3 registers in the left; frequency vibrato, adjustable in depth and frequency; musical effects - tremolo, glissando, drums, reverb, attack adjustment, tutti-organ; power output 25 watts. The dimensions of the electronic unit 830x500x250 mm. Two acoustic blocks of the accordion contain four loudspeakers of the 4GD-28 type. The price of the set is 1,400 rubles. Over the years of release there were two upgrades of the unit and acoustic units.