VERY GOOD OFFER!Best vintage soviet 3VCO analog synthesizer - ALTAIR 231.Altair 231 is an almost identical copy of the famous Moog`s Minimoog model D synthesizer made in the Soviet Union.It was manufacture on "Estradin" military radio plant in Zhitomir city in August 1986. The serial number of the unit # 2643. With Original case and Original pedal.Some knobs have noise. It has the inscription "Yamaha". But this can be removed by (acetone, gasoline etc).For more good sound, replacement of electrolytic capacitors is required. No midi and upgrade. All Original and not damaged. 2 caps on switch's is lost, but it can be switchedIt was not repaired and had no unwanted fix(bad soldering, etc)Inside like new.Biggest difference in sound is caused by different brand of components: Russian equivalents are used everywhere. The oscillator board is based on the older version. However, the Russians were clever and used multi-turn potentiometers for the scaling controls. Result: Synth stays in tune better. The Russians didn't seem to have reverse log pots. Because of that, the resonance control was wired backwards and a regular logarithmic pot was used instead.  Other than that, the synth seems to be very robust and easy to service - the real Mini schematics come for good help when comparing the component numbers etc. It sounds like a Mini! I heard a Mini with the newer oscillator board and I think that's the reason for minor differences in sound between it and the Altair. It is a monophonic 3 OSC analog synthesizer. Synth has 4-oct keyboard (F-C) with velocity (sensitivity assign to vibrato effect). The synthesizer has based on 3 VCO (osc. No.3 can work as the modulator), 1 VCF (lowpass 24dB/oct)with ADSR, 1 VCA, 3 LFO, noise generator (white/pink), portamento, memoryloop. It has an EXTERNAL INPUT allowing to use FILTER and GENERATORS with external audio INPUT. OSCILLATORS section: - osc 1,2,3 registers - 2", 4", 8", 16", 32", LF - osc 1,2,3 waveshape select - triangle, saw, square, pulse, sine - osc frequency - freq 1..3, freq 2, freq 3 -linked to keyboard pitch on/off (osc 3 ONLY) MIXER: - osc 1,2,3 on/off, level - ext input level, on/off - noise generator level, on/off - noise mode switch: white/pink MOD section: - portamento on/off, rate; - mod mixer knob: balance between modulated by OSC3 and noise, depth amount; - pitch wheel (glissando) FILTER: - mod on/off - cutoff, resonance, brightness - attack, decay, sustain - keytrack on/off AMPLIFIER: - attack, decay, sustain - key hold memory on/off Next - global section: main volume, phones volume, phones out (5din), A-440Hz tone on/off, power.  Connections : Audio OUTPUT, Audio INPUT on standard 1/4''jack, pedal input on 5-Din socket , power wire connection (220/240V), fuse (0,5A).SOLD AS IS. OLD VINTAGE GEAR.You have a chance to buy rare legendary synth for incredibly low cost!All of the pictures are actual, you will get what you see. Item will be well pack.The package is trackable.Description: ruskeys.net/eng/base/altair231.phpFeel free to contact me to find out more