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Tuesday, November 01, 2016
Vintage 1981 Sequential Circuits Pro One SN 3380
via this auction
"This auction is for one vintage used 1981 Sequential Circuits Pro One analog synthesizer keyboard project. I purchased this keyboard several years ago and intended to restore it but I never got around to it. This keyboard powers up and is working. Only half of the keys are working and they are all stiff. The pots and switches could stand to be cleaned. This synth has been in storage for a long time. With that being said, this keyboard is being sold "as-is" for parts or repair. Cosmetically, the keyboard shows wear including scratches and some dings on the wood sides but still looks nice overall (see pictures). The 'AMOUNT' knob under the modulation section is missing (see pictures). The plastic shaft is still there and the pot works fine."
Curious if this is a J-Wire version. If so the wires that make contact with the bus bar could just be bent. I once picked up a Pro-One for $125 because it had a stuck note. I opened it up, bent the j-wire back straight and all was good. No stiff keys though...
Update: see this video for and example of j-wires on a Micromoog.