MATRIXSYNTH: Oberheim OB-XA SN 824213 w/ Encore MIDI

Wednesday, September 16, 2020

Oberheim OB-XA SN 824213 w/ Encore MIDI

via this auction

"Fantastic condition, great sound and a truly classic synth!
OBXa comes with ENCORE MIDI.
ITEM is really heavy, will be packed by a professional via DHL/UPS.
NO butchering of case, wood sides, just installation of MIDI on back panel for modern integration.

Serviced by Rosen Sound in 2019 here is a list of the work that has been done -

- All voice cards removed, recapped, and new 28 turn INIT tuning trimmers added
- Both voice card motherboards removed and reflowed solder to the aged wave solder joints
- Replace ALL TL084 opamps, CD4051 MUX, and CD40174 flip flops on the CPU boards, all very common failing components.
- Selectively replace matched resistor sets for CV's between top and bottom boards
- Re cap PSU and add multi turn trim pots for the -5 and +15 lines
- Re cap both CPU boards
- Service left hand controls
- Replace common failing DIP switch on front panel, clean all pots
- Changed the power switch to an original carlington style switch
- Full calibration of all computer functions and analog functions
- Perform all needed factory updates for noise level and volume between voices, etc."

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