via this auction
"Own a piece of history!
Very rare 1970's era vintage complete synthesizer package. Works great!
This was my unit and I am the the original owner of it. It has been stored safely in an A/C controlled climate (my closet) for the last 30 odd years. 
I tested each module and recalibrated each of the three VCO's so they track correctly. Everything works as expected. The keyboard and sequencer also work.
Please note this is a monotonic keyboard setup. That means only one note can be played at a time. Also this an analog synthesizer.To get a sound out of it, the panel is configured using patch cables (control and audio). Remember this is almost 40 year old technology! With that said, it is lots of fun to experiment with and learn how music synthesis works. There are lots of knobs to adjust and endless combinations using the patch cables. 
Most everything is original equipment. The only non-standard section is on the keyboard itself. It has an original PAIA Veloci-Touch Controller, but this controller was originally in its own case and was retro-fitted into the keyboard along with a joystick. The pictures (keyboard and documentation pics) help explain this.
Includes the original documentation (along with several duplicates) so you can learn how each module works, how to use each module, and use for calibration and service if ever needed.Also includes very rare 'The Source' book that demonstrates different patch setups.
Includes the following:
Keyboard8782 Digitally Encoded keyboard
4761 Road Case
8786 Veloci-Touch Controller (retrofitted into keyboard)
Modules
Left Side4712 Reverb Module (analog spring type)
4720A Voltage Controlled Oscillator (1 of 3)
4720A Voltage Controlled Oscillator (2 of 3)
4750 Control Oscillator/Noise Source
8780 Equally Tempered Digital To Analog Converter
4745 Envelope Generator (1 of 2)
4730 Multi-Modal Filter (Voltage Controlled Filter) (1 of 2)
4710 Balanced Modulator and Voltage Controlled Amplifier (1 of 3)
4751 Patch Block (1 of 2)
Right Side4771 Regulated Power Supply
4720A Voltage Controlled Oscillator (3 of 3)
4711 Mixer
4751 Patch Block (2 of 2)
4745 Envelope Generator (2 of 2)
4730 Multi-Modal Filter (Voltage Controlled Filter) (2 of 2)
4710 Balanced Modulator and Voltage Controlled Amplifier (2 of 3)
2720-11 Envelope Follower/Trigger
Sequencer
4770 Watt Block (1 of 2)
4770 Watt Block (2 of 2)
4780 Sequencer (up to 12 steps)
4710 Balanced Modulator and Voltage Controlled Amplifier (3 of 3)
Cables
Control and audio patch cables
Documentation
4712 Reverb Module (1 copy)
4720A Voltage Controlled Oscillator (2 copies)
4750 Control Oscillator/Noise Source (2 copies)
8780 Equally Tempered Digital To Analog Converter (1 copy)
4745 Envelope Generator (3 copies)
4730 Multi-Modal Filter (Voltage Controlled Filter) (2 copies)
4771 Regulated Power Supply (1 copy)
4720A Voltage Controlled Oscillator (3 of 3)
4711 Mixer (1 copy)
4730 Multi-Modal Filter (Voltage Controlled Filter) (2 of 2)
4710 Balanced Modulator and Voltage Controlled Amplifier (1 copy)
2720-11 Envelope Follower/Trigger (2 copies)
4770 Watt Block (2 copies)
4780 Sequencer (2 books assembly and using the sequencer) (1 copy of each)
Also includes:
'The Source' Book of Patching and Programming from Polyhony."
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