MATRIXSYNTH: Oberheim OB-Xa 8 Voice Synthesizer SN 823705


Friday, July 25, 2025

Oberheim OB-Xa 8 Voice Synthesizer SN 823705

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via this Reverb listing

SN 823705 was previously listed back in 2014. Pics of the inside below.

"I completely overhauled this machine with the voice card kits from synth chaser, plus the main capacitors and the key bushings. I was really happy with how the calibration turned out. And the keybed is level and clack-free now! All-in-all, in excellent playing shape and should work great for years to come. But it is of course still a vintage machine, so it is what it is! Hear it at the youtube below [previously posted here]. The first melody is from the tuned filter resonance!

Voice tune process sometimes requires a second pass when the unit is warming up, but it has always tuned up since the recap after an autotune or two."

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