Jump to content

Altair Estradin 231

   (0 reviews)

Altair 231 is an almost identical copy of the famous Moog Minimoog, made in the former Soviet Union. 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) .

Technical Specifications
Type: Analog
Synthesis: Subtractive
Oscillators: 3
Waveforms: Pink Noise, Pulse, Saw Up, Sine, Square, Triangle, White Noise
Osc Modulation: Envelope, Glide / Portamento, Keyboard, Knob, LFO, Mod Wheel, Pitch Wheel
Envelopes: 2
Evelope Paramerters: Attack, Decay, Sustain
Filters: 1
Types: 24dB Slope (4-pole), Low Pass, Resonance
Filter Modulation: Envelope, Keyboard, Knob, LFO
LFO: 1
LFO Parameters: Noise, Saw Down, Sine, Square, Triangle
Polyphony & Tuning
Polyphony: 1
Timbrality: 1
Tuning: Standard
Modes: Mono
Case: Keyboard
Keyboard: 49 keys
Controls: Knobs, Switches, Mod - Wheel, Pitch -Wheel
Display Type: LED
Dimensions (WxDxH): 745 x 350 x 185 mm
Weight: 11 kg / 24 lbs.
Audio Output Connections: 1/4" Phone Jack, Mono Out
Inputs: 1/4" audio input
Power: 220V AC
Year Released: 1983
Year Discontinued: 1984
Patch Sheet
Used Price: $800 - $1,200 - convert
References & Sources

  Report Synthesizer

User Feedback

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.


  • Create New...