Note: links to listings are affiliate links for which the site may be compensated.
via this VEMIA listing
"Yamaha CS70m. European plug 220V, 6 (dual) voice synth. It has the Kenton midi mod. All voice cards have been checked and tuned. It has received final calibration by artefacts.nl . I'm not keen on shipping it, so ideally this would be collected from Belgium or possibly Netherlands. VEMIA may be able to organise this if necessary, given time."
Pics of the inside below.
Showing posts with label synth guts. Show all posts
Showing posts with label synth guts. Show all posts
Tuesday, October 14, 2025
Friday, October 10, 2025
rare birds: Elgam Carousel (with DINSync mod)
Note: links to listings are affiliate links for which the site may be compensated.
video upload by ohm_studi_ohm
"Quick demo of the Elgam Carousel I just serviced and modded by adding external clock and start synchronisation (DIN Sync) and an extra output to have dedicated outputs for drum and accompaniment section.
I used a Roland CR8000 to clock the Carousel but any drum machine / sequencer that uses DIN Sync or send 24ppq pulses will work, like the Arturia Keystep range.
This open a world of possibilities. The second output is quite useful especially in a live situation where you'd want drums and accompaniment parts to have different fx. In the demo the drum part is recorded dry and the accompaniment part goes through a Zoom MS70CDR to have filter delay. (CR8000 goes through the Dynacord VRS23)
Since you can clock the Carousel you can even record seperate arrangement tracks without having to worry about sync issues."
via this eBay listing
"Quite rare italian analog drum machine and accompaniment synth.
Unit was fully serviced and is in perfect working condition:
- every electrolytic capacitors were replaced
- fully calibrated
- an external clock / start sync was added. You can now sync and start the Carousel with any device that send 24ppq clock pulses, like DINSync (used in Roland CR78, CR8000, TR808 etc) or modern devices like Arturia Keystep clock output. If requested I can provide for free a TRS mini jack to DIN cable in order to use with devices that uses that connectors like Arturia. There is a switch to flip from internal to external clock.
- a second audio output was added to solo the drum part. When inserting a jack the drum sound is removed from the main output and goes to that second one, so you have seperate outputs for drum and accompaniment."
video upload by ohm_studi_ohm
"Quick demo of the Elgam Carousel I just serviced and modded by adding external clock and start synchronisation (DIN Sync) and an extra output to have dedicated outputs for drum and accompaniment section.
I used a Roland CR8000 to clock the Carousel but any drum machine / sequencer that uses DIN Sync or send 24ppq pulses will work, like the Arturia Keystep range.
This open a world of possibilities. The second output is quite useful especially in a live situation where you'd want drums and accompaniment parts to have different fx. In the demo the drum part is recorded dry and the accompaniment part goes through a Zoom MS70CDR to have filter delay. (CR8000 goes through the Dynacord VRS23)
Since you can clock the Carousel you can even record seperate arrangement tracks without having to worry about sync issues."
via this eBay listing

Unit was fully serviced and is in perfect working condition:
- every electrolytic capacitors were replaced
- fully calibrated
- an external clock / start sync was added. You can now sync and start the Carousel with any device that send 24ppq clock pulses, like DINSync (used in Roland CR78, CR8000, TR808 etc) or modern devices like Arturia Keystep clock output. If requested I can provide for free a TRS mini jack to DIN cable in order to use with devices that uses that connectors like Arturia. There is a switch to flip from internal to external clock.
- a second audio output was added to solo the drum part. When inserting a jack the drum sound is removed from the main output and goes to that second one, so you have seperate outputs for drum and accompaniment."
Wednesday, October 08, 2025
Oberheim OB12 Z-Domain Blue synthesizer Missing Data Knob
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
via this eBay listing
Tuesday, October 07, 2025
Moog Polymoog 203a 1976 Polyphonic Vintage String Synthesizer w/ Model 285A Polypedal Controller
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
via this Reverb listing
Pics of the inside below.
Monday, October 06, 2025
Iconic British OSCar Synth is Reborn
video upload by Starsky Carr
Guestimate price (just after 6:50) of £2.5k GBP which comes to $3371 USD.
"The legendary OSCar synthesizer is back! In this video, I'm joined by Paul from PWM Instruments, who recently acquired the rights to the Oxford Synth Company. In this he talks us through their new synth - a modern recreation of the iconic OSCar - a secret weapon for artists like Jean-Michel Jarre, Ultravox, Stevie Wonder, Orbital, and Underworld - and explains how the new OSCar stays true to the original’s gritty charm while adding modern upgrades for today’s producers.
Its currently at prototype stage - but the proof of concept has been demonstrated, so the next stage is to mould it into a commercial product.
Whether you’re a synth enthusiast, a producer hunting for that British synth grit, or just curious about iconic electronic instruments, this deep-dive demo will show you why the OSCar still inspires decades later.
Hear a short demo of the unmistakable OSCar growl, discover its quirks, and see why this rebirth matters for synth lovers everywhere."
Restored Crucianelli Compac Synth FULL DEMO - Sounds, Calibration & Tuning
video upload by R.O.T. Studios
"Playing with our newly restored Crucianelli/Crumar Compac Synth."
"Yep, the Crucianelli Compac Synth finally works fully. Tuning it was a PITA but glad we finally got to demoing it properly. I brought my new film studio equipment and multiple cameras, plus my studio PC + audio interface for extra quality :)
Now onto other projects!
0:00 teaser
0:17 final repairs
1:55 testing keyboard & VCO
2:58 calibration of VCA & VCF
5:04 tuning (100 trimmers)
8:39 final touches
9:30 History of the synth
16:28 FULL DEMO"
Sunday, October 05, 2025
The New King Of LoFi Sampling By Brüel & Kjaer...wait what?
video upload by HAINBACH
Don't miss the follow-up video here.
"I thought I had seen it all in my 'will it music' test equipment journey. Then I stumbled upon the Brüel & Kjaer 7502 Digital Event Recorder and my mind was blown. They accidentally (?) designed a wonderful lofi pitch shifting echo, that allows for extreme effects. It can even be played as a keyboard controlled sampler with a range wide enough to turn everything into digital dust. An absolute gem and worth saving from the trash heap that all these instruments end up sooner or later.
Sample pack: / hainbach
MY MUSIC: http://hainbach.bandcamp.com
MY SIGNATURE SOFTWARE: HAINPACK: https://www.audiothing.net/bundle/hai...
GRANULAR SYNTH: https://apps.apple.com/de/app/fluss-g..."
Friday, October 03, 2025
Inside Pete Townshends Legendary EMS VCS 3
video upload by Really Nice Audio
"Is it possible a fatigued fuse could bring this legendary synth to its knees? Let's find out and also see how easy it will be to convert the VCS-3 from 115V to 240V.
This synth is part of Pete Townshends synth collection housed at the University of West London https://www.uwl.ac.uk/study/study-fac...
#synth #analogsynthesizer #petetownshend #vcs3
#ems #maintenance #vintage"
The museum was unveiled on October 10, 2024.
Adventures in Audio - Technics SX K200
video uploads by Manitou Productions
Playlist:
1. Adventures in Audio - Technics SX-K200
Part one of three episodes covering the Technics SX-K200 from 1982. In this episode we examine its current state and hear some sounds before moving on to cleaning and evaluation. Let's go!2. Adventures in Audio - Technics SX-K200 - Repair
Chapters:
0:00 A little sketchy
0:09 Opening titles
0:17 Intro
1:53 Power on
2:43 It makes sound
3:01 Three dead keys & problem buttons
3:32 More sounds
4:32 A look at the cartridge
4:59 Chorus effect and solo synth sounds
8:18 To the workbench!
8:42 Cleaning time!
11:50 Disassembly time!
12:48 The innards
15:23 Forensic files
18:57 Outro
19:14 Pinot's Corner
We return to the vintage Technics SX-K200 keyboard as it undergoes minor repairs and servicing to restore functionality. Not much 'audio' this time around, but you'll see a good deal of the inner workings.3. Adventures in Audio - Technics SX K200 - Post Repair Test
Chapters:
0:00 These come off pretty easily
0:20 Titles
0:27 The innards, freshly cleaned
1:07 Restoring the non-working keys
4:54 Removing the key-bed for cleaning
6:04 Removing the control board
8:11 Cleaning the switches and faders
10:43 Repairing the start switch
11:56 Progress report
12:25 Removing residue from a circuit board
13:24 Replacing the control board
14:38 Testing button connectivity
15:14 Removing the dead speaker
16:43 Replacing the key-bed
17:12 Cleaning under the good speaker
17:53 Repairs complete
18:23 Outro
18:58 Pinot & Ivy's Corner
In the final part of our look at the Technics SX-K200 keyboard/synthesizer, we find out how successful the repairs were and check out the sounds and functions. Let's go!
Chapters:
0:00 That didn't work
0:08 Titles
0:15 Intro
0:55 Testing the keys
1:45 'One finger'
2:44 The sliders
2:55 Rhythms
4:22 Fill in & intro
5:04 The sounds
9:56 Organ tremolo
10:39 Celeste & chorus
12:01 The solo synth sounds
13:37 Green LEDs
13:55 Transpose
14:50 Technichord
15:59 Demo tunes
18:06 The memory pack
18:47 Outro
19:32 Pinot & Ivy's Corner
Wednesday, October 01, 2025
Moog MiniMoog Voyager XL Oscillator and Pitch Bend Wheel Calibration Procedure - Internal Photos
video upload by WayneJoness
"Details on the Oscillator and Pitch Bend Wheel calibration."
https://gr300.com/pdf/moog/voyager_tu...
Sunday, September 28, 2025
Wersi Wersimatic WM24 / like Elgam Carousel Godwin Drummaker CX1
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"Rare analog drum machine and auto accompaniment unit from Germany. Very much like italians units like Elgam Carousel, Elka Wilgamat or Welson Ritmo, and predecessor of the CX1.
VIDEO DEMO [previously posted here]
Unit was fully recapped and is in fully working condtion.
As an early 70s unit except some backgroun noise but nothimg major, check the démo.
Cosmetic is quite good with some wear.
Comes with original DIN and jack cables to plug the keyboard to the drum expander."
via this Reverb listing
"Rare analog drum machine and auto accompaniment unit from Germany. Very much like italians units like Elgam Carousel, Elka Wilgamat or Welson Ritmo, and predecessor of the CX1.
VIDEO DEMO [previously posted here]
Unit was fully recapped and is in fully working condtion.
As an early 70s unit except some backgroun noise but nothimg major, check the démo.
Cosmetic is quite good with some wear.
Comes with original DIN and jack cables to plug the keyboard to the drum expander."
Wednesday, September 24, 2025
OSCar Repair
video upload by Really Nice Audio
"Join me a quest to bring this Oscar synth. Its has mainly cosmetic issues and there are a couple of surprises hidden inside!
Many thanks to
https://www.vintagesynthparts.com
for replacement keys. Well worth a look as they have many obscure parts for many synths.
Music from my forthcoming ATMOS album 'Height Supremacy'. I used this because the main synth line is my OSCar!"
Monday, September 22, 2025
Weston PRO-2021 Analog Synthesizer - DIY SCI Pro-One
Note: links to listings are affiliate links for which the site may be compensated.
video upload by JSI
See the Weston label below for additional posts.
via this Reverb listing
Pics of the inside below.
video upload by JSI
See the Weston label below for additional posts.
via this Reverb listing
Pics of the inside below.
Tuesday, September 16, 2025
Roland JD-800 61-Key Programmable Synthesizer
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
via this Reverb listing
Pics of the inside below.
Monday, September 15, 2025
Kawai SX240 8 Voice Polyphonic Hybrid Synthesizer SN K-8963 w/ Extras
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
Pics of the inside below.
"With Extras:
Tauntek O/S
Real Walnut side panels (very nice)
Pro-Serviced with new CR2032 battery this month (9/25)
Clean & pristine a true 9.9/10
Hard Case (case condition is Fair). not pictured
There were only a few hundred ever made of these!"
via this Reverb listing
Pics of the inside below.
"With Extras:
Tauntek O/S
Real Walnut side panels (very nice)
Pro-Serviced with new CR2032 battery this month (9/25)
Clean & pristine a true 9.9/10
Hard Case (case condition is Fair). not pictured
There were only a few hundred ever made of these!"
Jomox JazBase03 Analog Drum Synthesiser
Note: links to listings are affiliate links for which the site may be compensated.
video upload by Rec Gear Demos
via this Reverb listing
Pics of the inside below.
video upload by Rec Gear Demos
via this Reverb listing
Pics of the inside below.
Sunday, September 14, 2025
The Secretive History of Pop Music's Favorite Vocoder | Sennheiser VSM201
video upload by HAINBACH
"Kraftwerk, Jean-Michelle Jarre and Daft Punk are among the artists that used the rare Sennheiser VSM201 Vocoder from 1977. It is one of the very best examples of its kind, as its 16 bands allow both for high voice intelligibility and experimental tomfoolery. Yet there is also a history behind it that is still so secret, Sennheiser are still not allowed to talk in detail about it. Thanks to Sennheiser for allowing me access to their archives and the prototype.
Get the Vocoder Decent Sampler Instrument and Music from this video: / hainbach"
Sunday, August 31, 2025
Waldorf Microwave Rev A
Note: links to listings are affiliate links for which the site may be compensated.
via this eBay listing
Pics of the inside below.
"Rev A blueface Microwave (CEM chips) with OS 2.0 installed. Great working condition, sounds amazing - light rack rash, left rack ear slightly bent, missing one screw from top cover (see photos)."
via this eBay listing
Pics of the inside below.
"Rev A blueface Microwave (CEM chips) with OS 2.0 installed. Great working condition, sounds amazing - light rack rash, left rack ear slightly bent, missing one screw from top cover (see photos)."
Friday, August 29, 2025
Sneaky Little PPG
video upload by foleytronics fx repair
"Found it #electronics #synthesizer #repairing #vintage #sneaky"
PPG 1002
Saturday, August 16, 2025
EMS Vocoder 5000 Repair
video upload by Really Nice Audio
"The time has come that bridge rectifiers from the mid 70's can fail short due to age. In this repair I managed to find a blown one and another that was on its way out! This was an RS bridge rectifier dated 1976.
This EMS Vocoder 5000 belongs to Pete Townshend and is housed at The University of West London.
https://www.uwl.ac.uk/study/study-fac...
Music from my forthcoming ATMOS album 'Height Supremacy'
https://www.galactichorizon.com
#ems #vocoder #repair #emsvocoder5000 #petetownshend #bridgerectifier #blowsfuses"
SN VOC 8
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© 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