1980s Oberheim Matrix-12 (Fully Serviced) w/ ATA Flight Case SN P63707

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via this Reverb listing

Additional SYNTH CITY Listings

"The Oberheim Matrix-12, released in 1985, is a legendary analog synthesizer known for its deep modulation capabilities and lush, complex sounds. It was essentially two Oberheim Xpander modules combined into one keyboard unit, offering 12-voice polyphony with dual oscillators per voice and extensive matrix modulation routing. Designed during the peak of Oberheim's innovation period, the Matrix-12 marked the end of the company's original era before Tom Oberheim's departure. Despite being released just before digital synthesis took over the market, it remains a revered instrument for its rich analog tone and flexibility.

This synth is in fantastic shape for it's age, minor cosmetic blemishes throughout. Includes a newer flight case by Clydesdale as shown.

The recent servicing ensures that all voice cards, filters, envelopes, and modulation routings are fully operational, with cleaned contacts, calibrated tuning, and updated components as needed for optimal performance. (Serial no. P63707)

Service notes:

FIRMWARE V 1.1
-Recapped and refurbished power supply
-Repaired several bad voices
-Replaced one of the displays
-Disassembled voice card stacks and repaired damaged hinge hardware
-Reinstalled PCBs
-Cleaned all controls and switches
-Cleaned key-bed assembly
-Replaced missing cassette interface IC
-Replaced memory battery and reloaded factory presets
-Replaced volume potentiometer
-Cleaned bender assembly
-Calibrated DAC and displays"