MATRIXSYNTH: SEQUENTIAL CIRCUITS PRO-ONE SN 9584

Thursday, November 25, 2021

SEQUENTIAL CIRCUITS PRO-ONE SN 9584



via this auction

Additional Tone Tweakers Listings, also on Reverb

"Fully disassembled, cleaned inside and out, and meticulously serviced and reassembled. Working perfectly. This process was performed by an expert vintage synth tech and took nearly 12 hours. The end result is an instrument that's better than the rest and is priced accordingly. Ready to play, no excuses.

Tech notes:

Replaced power cable.
Replaced molex connector terminals (2)
Replaced capacitors T2.2/25 x4
Repaired broken standoffs, which are very common in Pro-Ones - see additional screws in front panel.
Removed bender unit and wheels, replaced terminals.
Opened, cleaned and lubed, reassembled.
Cleaned all switches and pots for crackle free performance.
Installed new 16p IC socket.
Recalibrated VCA offset, D/A scale for CV, VCOs, adjusted bender, checked mod wheel, cleaned jacks.
Burn in test. Multiple systematic tests over extended period of time.
Unit works perfectly and sounds great!

This Pro-1 left the factory with the later membrane style keyboard Sequential switched over to later on in their production run. We had our tech service this keyboard and its now working perfectly, but the keys on this type of mechanism are a bit harder to play due to the mechanism design, so we removed that keyboard and replaced it with a newly designed 3rd party keyboard that feels much better. We're selling the membrane keyboard separately, but we can probably swap them out again if you'd like the original keyboard instead (if we still have it). We don't recommend it though as the new keyboard is much more pleasant to play.
We replaced the wooden sides with brand new replicas made by a third party."

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