Published on Oct 10, 2014 Pulsewidthmod
via this auction
The seller also has a Moog Etherwave Theremin listed here.
"The OR400 is also labeled as the Siel Orchestra 2 & the Sequential Circuits Prelude The only thing this synth is lacking/missing are the fader caps. For the technically inclined or curious: all the CMOS chips were replaced, some of the flex cables were replaced with ribbon cable, the power supply was rebuilt using some modern voltage regulators, and a three prong power socket was installed to get rid of the annoying attached power cables."
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