via this listing
Additional Perfect Circuit listings
Monday, December 29, 2025
Nonlinear Labs C15 Digital Keyboard Synthesizer + Flight Case
Note: links to listings are affiliate links for which the site may be compensated.
via this listing
Additional Perfect Circuit listings
via this listing
Additional Perfect Circuit listings
Akai AX60 Polyphonic Analog Keyboard Synthesizer
Note: links to listings are affiliate links for which the site may be compensated.
via this listing
Additional Perfect Circuit listings
via this listing
Additional Perfect Circuit listings
Oberheim Xpander Desktop 6-Voice Synthesizer G50218
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"Near perfect condition. Passes all tuning. Latest firmware. Comes with heavy duty flight case."
via this Reverb listing
"Near perfect condition. Passes all tuning. Latest firmware. Comes with heavy duty flight case."
Oberheim OB-X 6-Voice (1979) – Fully Restored SN T92612
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"1979 Oberheim OB-X 6-voice analog polyphonic synthesizer in excellent cosmetic and functional condition. This unit has been fully professionally restored and is stable, reliable, and ready for daily studio use.
This is not a project or a fixer — it has been properly serviced and maintained.
Restoration
Recently (late 2024) fully restored by a Retro Pro Audio in Belmon CA. Complete restoration documentation included.
Work includes:
Power supply unit (PSU): Replaced voltage regulators (including failed LM337), bridge rectifiers, PSU filter caps. Replaced battery and added removeable battery holder. Calibrated
Full calibration of all 6 voice cards
Replacement of aging components where required
Keybed complete service and test
Control boards were removed and cleaned along with the front panel. All button contacts were cleaned and pots lubricated.
Installed a dedicated 5.6V power supply for the CV S&H circuit
Full functional testing and burn-in
All voices tune correctly and respond evenly across the keyboard.
Factory patches restored
Much more was done. Full details with photos available upon request. Comes with (unrestored) Oberheim factory volume pedal.
Condition
Very clean front panel with clear lettering
Excellent wood end cheeks
Clean rear panel and jacks
Only light wear. This instrument does not look 45 years old.
Overall, a very well-preserved OB-X.
Specs
6-voice configuration
No MIDI (original configuration)
Pratt-Read keybed
Approx. weight: 65–70 lb"
via this Reverb listing
"1979 Oberheim OB-X 6-voice analog polyphonic synthesizer in excellent cosmetic and functional condition. This unit has been fully professionally restored and is stable, reliable, and ready for daily studio use.This is not a project or a fixer — it has been properly serviced and maintained.
Restoration
Recently (late 2024) fully restored by a Retro Pro Audio in Belmon CA. Complete restoration documentation included.
Work includes:
Power supply unit (PSU): Replaced voltage regulators (including failed LM337), bridge rectifiers, PSU filter caps. Replaced battery and added removeable battery holder. Calibrated
Full calibration of all 6 voice cards
Replacement of aging components where required
Keybed complete service and test
Control boards were removed and cleaned along with the front panel. All button contacts were cleaned and pots lubricated.
Installed a dedicated 5.6V power supply for the CV S&H circuit
Full functional testing and burn-in
All voices tune correctly and respond evenly across the keyboard.
Factory patches restored
Much more was done. Full details with photos available upon request. Comes with (unrestored) Oberheim factory volume pedal.
Condition
Very clean front panel with clear lettering
Excellent wood end cheeks
Clean rear panel and jacks
Only light wear. This instrument does not look 45 years old.
Overall, a very well-preserved OB-X.
Specs
6-voice configuration
No MIDI (original configuration)
Pratt-Read keybed
Approx. weight: 65–70 lb"
Roland System 100 Model 102 Expander Restored by Rosen Sound
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"Restored by Rosen Sound out in LA 2 yrs ago. Recapped, functionality confirmed and all circuits calibrated. Works and sounds great.
Note that I have this listed together with the 101 and 104 as well [listed here & pics captured here]. Happy to sell all 3 units together or any of the 3 separately."
via this Reverb listing
"Restored by Rosen Sound out in LA 2 yrs ago. Recapped, functionality confirmed and all circuits calibrated. Works and sounds great.
Note that I have this listed together with the 101 and 104 as well [listed here & pics captured here]. Happy to sell all 3 units together or any of the 3 separately."
Vintage ELKA OMB5 + Original Bag, RAM Card & Manual
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"A vintage Elka OMB 5, the programmable arranger / rhythm unit specifically designed for Italo Disco, in perfect working condition and in mint cosmetic shape. The deal includes its ultra-cool original bag, owner’s manual, and a Song RAM cartridge. UPS fast delivery and professional packing guaranteed.
Released in the mid-'80s by the Italian manufacturer Elka, the OMB-5 (One Man Band) is a powerful yet easy-to-program arranger featuring a rhythm unit, a bass channel, and two accompaniment tracks.
RHYTHM UNIT
The OMB-5 comes with 20 preset rhythms (Disco, Funk..), each with four variations, one of which is fully programmable by the user — for a total of 20 storable custom drum sequences. Each preset rhythm also includes two fill-ins, an intro/ending, and a dedicated break.
The 32 drum sounds are the same as those found in the iconic Elka Drumstar 80: a cool selection 8-bit PCM drum samples, a perfect mirror of that unmistakable '80s aesthetic. The rhythm section is extremely easy and intuitive to program, and the ability to edit individual drum sounds within a recorded sequence using a single 'cancel' button is simply brilliant. A true example of vintage Italian clever design.
SOUND SECTION
The Elka OMB-5 features a powerful and flexible sound section totally based on FM synthesis and divided into three blocks:
Bass (6 voices)
Presets 1 (12 voices, 5-note polyphony)
Presets 2 (12 voices, 5-note polyphony)
Each block supports 6 arrangements per preset rhythm, with Arrangement 6 fully programmable, allowing up to 20 custom sequences to be stored per block (Bass, Presets 1, Presets 2).
Bass sounds : STRING BASS, BASS FLUTE, BASS GUITAR, ELECTRIC BASS, FUNK BASS, TUBA
Presets 1 sounds : STRINGS, BRASS, ELECTRIC GUITAR, BANJO, JAZZ GUITAR, MARIMBA, VIBRAPHONE, CLAVINET, ORGAN 1, PIANO 1, SYNTH 1, SYNTH 2
Presets 1 sounds : STRINGS 2, STRINGS 3, BRASS 2, PIANO 2, HARPSICHORD, ELECTRIC PIANO, ORGAN 2, CLASSIC GUITAR, CELESTE, HARP, SYNTH 3, SYNTH 4
COMMON FEATURES (All Sections)
Volume and sustain length adjustable via dedicated sliders
Usable in manual play or as part of the automatic accompaniment
Custom sequences storable in Arrangement 6 for each preset rhythm"
via this Reverb listing
"A vintage Elka OMB 5, the programmable arranger / rhythm unit specifically designed for Italo Disco, in perfect working condition and in mint cosmetic shape. The deal includes its ultra-cool original bag, owner’s manual, and a Song RAM cartridge. UPS fast delivery and professional packing guaranteed.Released in the mid-'80s by the Italian manufacturer Elka, the OMB-5 (One Man Band) is a powerful yet easy-to-program arranger featuring a rhythm unit, a bass channel, and two accompaniment tracks.
RHYTHM UNIT
The OMB-5 comes with 20 preset rhythms (Disco, Funk..), each with four variations, one of which is fully programmable by the user — for a total of 20 storable custom drum sequences. Each preset rhythm also includes two fill-ins, an intro/ending, and a dedicated break.
The 32 drum sounds are the same as those found in the iconic Elka Drumstar 80: a cool selection 8-bit PCM drum samples, a perfect mirror of that unmistakable '80s aesthetic. The rhythm section is extremely easy and intuitive to program, and the ability to edit individual drum sounds within a recorded sequence using a single 'cancel' button is simply brilliant. A true example of vintage Italian clever design.
SOUND SECTION
The Elka OMB-5 features a powerful and flexible sound section totally based on FM synthesis and divided into three blocks:
Bass (6 voices)
Presets 1 (12 voices, 5-note polyphony)
Presets 2 (12 voices, 5-note polyphony)
Each block supports 6 arrangements per preset rhythm, with Arrangement 6 fully programmable, allowing up to 20 custom sequences to be stored per block (Bass, Presets 1, Presets 2).
Bass sounds : STRING BASS, BASS FLUTE, BASS GUITAR, ELECTRIC BASS, FUNK BASS, TUBA
Presets 1 sounds : STRINGS, BRASS, ELECTRIC GUITAR, BANJO, JAZZ GUITAR, MARIMBA, VIBRAPHONE, CLAVINET, ORGAN 1, PIANO 1, SYNTH 1, SYNTH 2
Presets 1 sounds : STRINGS 2, STRINGS 3, BRASS 2, PIANO 2, HARPSICHORD, ELECTRIC PIANO, ORGAN 2, CLASSIC GUITAR, CELESTE, HARP, SYNTH 3, SYNTH 4
COMMON FEATURES (All Sections)
Volume and sustain length adjustable via dedicated sliders
Usable in manual play or as part of the automatic accompaniment
Custom sequences storable in Arrangement 6 for each preset rhythm"
Yamaha EW20 Wind Jamm'r SN 01711
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
"Yamaha EW20 Wind Jamm'r Midi Synth Sax Wind Controller
Includes the wind controller, synth unit, and pedal
You can use with the internal sound synthesis or connect to other synths via midi."
via this eBay listing
"Yamaha EW20 Wind Jamm'r Midi Synth Sax Wind Controller
Includes the wind controller, synth unit, and pedal
You can use with the internal sound synthesis or connect to other synths via midi."
tc electronic 2290 p Delay with Synths - No talking Demo
video upload by Limbic Bits
"tc electronic 2290 p Delay with Synths - Twisted Electrons MEGAfm and TWISTfm
This video shows the TC Electronic 2290 P Dynamic Delay, a modern pedal interpretation of the classic 2290 rack unit (which I’ve never owned but always found interesting). Build quality is solid and confidence-inspiring, and feature-wise it’s a moderately flexible digital delay with filter, true stereo, delay subdivisions and multiple modulation sources that allow for controlled, musical movement."
Squarp Instruments Hapax as the controller.
Vangelis Cover From Chariots of Fire: Abraham's Theme. #moogmuse #CS80 #3rdwave
video upload by Jose's Vintage Keys
"Playing with this beautiful melody - using OBX, Muse, CS80 and my new 3rdWave - with lots of vintage Lexicon"
Vintage Synths Doing Classic Horror Movie Themes | Top 8
video upload by Espen Kraft
"8 horror movie theme covers performed with a variety of classic 80s and 90s synths, samplers and drum machines.
The thumbnail image is not AI generated."
Roland JX-3P, Yamaha KX88, Roland Juno-106, Roland JX-8P, Elka OMB 5, Bit01, Roland Jupiter-8, John Bowen Solaris, Oberheim Matrix-12, Sequential Six-Trak, & Prophet-VS.
PREVIOUS PAGE
NEXT PAGE
HOME
© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
