"This Oberheim OB-1 is great condition for a rare Vintage Synth and has a really unique sound and a self oscillating VCF. It's had a MIDI and programmer PCB upgrade increasing presets to 64 in 8 banks of 8.
It's just been fully restored and serviced By Totally Technical in Brisbane Australia ( See restoration details below) - I'm happy to share a detailed report and video's on request. It's located in Brisbane Australia if you would like to inspect and have a listen."
"Full restoration completed over the last 18 monthsProgrammer PCB installed
New Battery
Many capacitors, IC’s, Diodes and resistors changed
Portamento fixed - IC
Keybed all fixed
Bend all fixed – IC
Crackly pots applied Faderlube and OK.
DC Voltage on output fixed
MCU BASED PROGRAMMER UPGRADE
In July 2025 a new MCU-based programmer pcb was installed giving it functionality and patch storage not available in the original. More details below and available here
64 programs in 8 banks of 8
Programs are stored in non-volatile EEPROM. No battery needed.
After a program is loaded, only controls that have moved are "live", so patch editing is now possible.
Manual mode forces all controls to be "live".
Optional (non-volatile setting) periodic flash of current bank selection
Optional (non-volatile setting) quantization of coarse freq for oscillator 1 to octaves
Comes with 24 pre-programmed patches, which can be over-written later if you chose
Smaller pcb mounts on four of the existing standoffs, providing better access to pcb underneath
Implemented connectors are the same as original programmer for easy installation
All IC's are socketed. All components are through-hole.
20-turn trimpot for easier one-time oscillator tuning adjustment
SYNHOUSE MIDIJACK UPGRADE
In 2009 a Synhouse Midijack was installed - More detail below and here
MIDI channel selection (to select MIDI reception channel 1-16)
MIDI panic button (to silence stuck MIDI notes)
MIDI Off mode (useful for keeping unused synthesizers silent onstage or for selecting built-in / local analog keyboard control and external control via control voltage gate interface jacks, also known as CV/gate control)
MIDI On mode (normal operation)
4-note buffer (for musical trill effects and for relaxed performance with automatic error correction)
Single note triggering (for legato performance)
Multiple note triggering (for articulated performance)
MIDI transpose select mode (for deeper bass)
Analog CV calibration mode
Receives MIDI Note On messages (full range, MIDI notes 0-127)
Receives MIDI Note Off messages (full range, MIDI notes 0-127)
Receives MIDI sustain pedal (controller number 64)"
No comments:
Post a Comment
Note: To reduce spam, comments for posts older than 7 days are not displayed until approved (usually same day).