Oberheim DMX 8-Voice Drum Machine SN B33309

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

Pics of the inside below.

"Oberheim DMX Drum Machine w/ MIDI, Upgraded OS, MRAM Upgrade, External CV Tuning Box, Walnut Side Panels, New Thumbscrews, Serviced By Electrongate January 2023

"Legendary Drum Machine with multiple big upgrades installed by Electrongate

Overall fantastic condition with some cosmetic wear as shown in photos

Includes an External CV Tuning Box, custom built by Electrongate which grants the user easy, real-time control of the pitch of each instrument without having to open up the unit. Big thumbs up!

This DMX has the DMX MIDI Expansion with upgraded Walnut Side Panels which boasts an updated, and much more capable Operating System. Printed Manual included for this new operating system.

Another big upgrade performed to this DMX is the MRAM Upgrade which doubles the memory and eliminates the need for a battery. No need to replace a battery ever again!

Please refer to the Electrongate website for more details about these upgrades

New Thumbscrews were installed at the time of service

Installations and repairs performed by DMX guru Paul White at Electrongate January 2023. Paul upgraded this DMX to the max, replaced some parts, cleaned the unit, and got everything running great."

CLICK FOR MORE »

Korg Polysix with Kiwi Technics Kiwisix

Note: links to listings are affiliate links for which the site may be compensated.
video upload by ohm_studi_ohm

"Demo of some patches I programmed on the Korg Polysix. This unit has the KiwiSix CPU board installed that adds many features (like MIDI, sequencing, 512 presets etc) without changing the sound of the synth.
The polysix is a true 6 voice VCO VCF VCA analog synth and it sounds great. By design however the enveloppe is slow and the sound a bit dark due to an added post FX VCF (LM13600). A simple mod allows to bypass this and let the synth shines. With this mod you get a very snappy and funky synth whose SSM2044 filters gets very well along the built-in chorus/phaser/ensemble FX. This unit has this mod done.
From funky keys, to lush string pads, the P6 has a very large scope despite its very limited features.
Only bad point of the P6 is that it has a fairly high noise level. Some improvement can be made like in this unit by adding more ground wires, applying copper foil on the bottom case and adding ferite around wires."

via this Reverb listing, also on eBay

"INSTRUMENT IS FOR SALE AT REDUCED PRICE ON EBAY DURING JANUARY ONLY"

Pics of the inside below.

"Serviced and fully working classic 6 voices analog poly synth.- brand new KiwiTechnics Kiwisix CPU board that adds lot of features (MIDI IN & OUT, CC, sequencer, 512 presets etc)

- all electrolytic capacitors were replaced (the P6 has many of infamous Panasonic CE capacitors that leak after decades of use)

- post FX VCF mod: this simple mod gives the P6 faster enveloppe and fuller sound. A must do on all P6, check demo.- improvement of the ground design by adding more and thicker ground wires, copper tape on the bottom case and ferrite around the data wires

- full calibration

Unit is fully working and sounds great. As expected with these Polysix there still is some light background digital noise due to design, but nothing major, check demo to hear how it sounds.

Cosmetic is good with some scuffs here and there, especially on the case as it often is the case on P6. One switch cap ("hold") is not original."

CLICK FOR MORE »

Thomas Synti 1055 - Vintage Synthesizer 1972

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

Pics of the inside below.

The Thomas Synti 1055 is a" monophonic analog synthesizer produced in the 1970s by the Thomas Organ Company, which in 1973 acquired the rights to produce the Moog Satellite, one of the first synthesizers made by the historic American company.The original design was extended and improved by Thomas engineers, who managed to create an instrument that was more comfortable and simple to use live, while maintaining the same character and sonic depth as its predecessor.The completely analog heart of this instrument consisted of a single relaxation oscillator, capable of generating a single sawtooth (or square) wave, which was then filtered and processed by various downstream circuits to shape its harmonic content and envelope. It's clear that these techniques couldn't achieve "realistic" sounds in the modern sense of the word, but they still managed to create unique timbres, still very interesting today, which inspired much of the music of the time."

CLICK FOR MORE »

Rhodes/Fender Chroma Polaris Main Board

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

"Bought brand new from Syntaur a couple of years ago to use in a restoration project which never won up happening; it has sat new in the box since it arrived at my house."

CLICK FOR MORE »

Why The Minimoog Voyager Old School Has Such Short Release Times On Envelopes.

video upload by synthpro

"Hey Guys,
Thought some of you who have the Minimoog Voyager Old School may appreciate this video. I explain why some of the pots may have different responses compare to the models with the computer for presets. I focus on the envelopes in particular in this video but I'm sure there are other knobs that do not behave the same as well."

Yamaha CS-80 - first encounter with a legend

video upload by The Synth King

"Hi,
here is a video of my first encounter with the legendary Yamaha CS-80. The owner ask me to do a thorough inspection of the instrument and help him to sell it. This video lists all technical and cosmetic issues of the instrument. Please contact me if you´re interested in this fantastic instrument. [contact The Synth King on YouTube] Enjoy the music!
Bernd"

Fixing A Cute Synthesizer - Schober Tunesmith

video upload by LOOK MUM NO COMPUTER

"Another oddity from the past!
Download the sampler VST insterument! a whole lot more! and support these projects whilst you are at it here! :- / tunesmith-sample-140168907
Also full version of 'oh i do like to be beside the seaside'
Which also supports ‪@THISMUSEUMISNOTOBSOLETE‬ "

Casio FZ-1 – Installing the New OLED Display Kit

video upload by EMW Synthesizers

Addtional EMW Casio posts

"INFORMATION

The project works perfectly for normal use of the FZ-1, FZ-10M and FZ-20M. All menu screens, editing pages, sampling functions, parameters and general operation display correctly. Only a few fully graphical screens, such as Hand Drawing, Sin Synthesis and Graphic Envelope, may show minor pixel irregularities. This does not affect usability in any way; these functions continue to work normally and the issue is purely visual.
As I no longer have time to continue development, I do not plan to refine these small graphical details. Even so, the kit leaves the FZ fully usable, which is exactly what allowed me to bring my own FZ-1 and FZ-20M back to life and use them normally again.

FZ-1 Kit

For the FZ-1, we supply a complete kit, including:
A dedicated support with the logic board.
A second support with the new OLED display that fits perfectly into the original display mounting position.

Installation requires no soldering and no special skills. The kit uses the original FZ-1 mounting screws, and the entire installation can be completed in under 20 minutes.
Please watch the FZ-1 installation video on our YouTube channel for a full step-by-step demonstration.

FZ-10M and FZ-20M Kit

For the FZ-10M and FZ-20M, we supply a single integrated assembly including the support, logic board and display. This assembly fits perfectly into the original display location of the module.

Installation is very simple, requires no soldering, and typically takes around 15 minutes. The process is also demonstrated in the installation video available on our YouTube channel.

Pricing and Ordering

The price for the kit (logic board, display, supports and cables) is US$249.00 + shipping.

CLICK FOR MORE »

Vintage 1985 Oberheim Matrix 6 Analog Polyphonic Synthesizer w/ Original Box & Extras

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

Pics of the inside below.

"Mint condition vintage 1985 Oberheim Matrix 6 analog polyphonic six voice synthesizer. Boxed complete retail package with original manual, cassette, pedal footswitch, warranty card and promo brochure as pictured. Following the larger Matrix 12 and Xpander models, the Matrix 6 is a full size 61 key 5-octave keyboard design which shares circuitry with the Matrix 6R and Matrix 1000 rack format synthesizers. Original CEM3396 voice chips dated to late 1985. Perfect operation and looks and plays like new. Manual is in Japanese, but English PDF downloads are available in various places online. Power operation is original 100-120V AC, and takes a standard IEC cable. The Matrix 6 can also very easily be converted to 230-240V by simply re-aligning the fuse placement inside, as the internal power transformer is designed for full worldwide operation between 100-240V."

CLICK FOR MORE »

Vintage 80’s Oberheim DSX 16-Voice Vintage Digital Polyphonic Sequencer SN 432909

Note: links to listings are affiliate links for which the site may be compensated.

via this eBay listing

Pic of the inside below.

CLICK FOR MORE »

Oberheim PHASOR P-100 Pedal aka Maestro MPS-2 Miniphase. 1974 Pot & Chip dates SN 1605

Note: links to listings are affiliate links for which the site may be compensated.
video upload by Edward Jones

Casio MT-40 through Oberheim Phasor P-100

video upload by Edward Jones

via this eBay listing

Pics of the inside below.

"Genuine 1974/5 early production Oberheim Phasor aka Maestro Mini-Phase.

This is legitimately a piece of guitar pedal history!

IC and Pot values date this to Late 74. IC dates are 18th and 23rd week of 1974. Pot 38th week 1974.

All original, all parts functioning.
All capacitors are working as intended, so none have been changed.

Designed by legendary Tom Oberheim.
While it's not the first phaser to ever hit the shelves, the Maestro Mini-Phase and this Phasor are the firs "Pedal" format phaser in the form factor we all know and love.

This is a buffered bypass pedal.
Anyone claiming theirs is True Bypass has either modified it, or misunderstands true bypass and are just using it as a buzzword.
I included the schematic for you.

This has seen little use it has not been used for the last 25 years as it was in storage.
The owner had it stores in a box of miscellaneous equipment, which was mislabled.
Some battery leakage as shown, but the battery holder is not adjacent to PCB so no functional damage occurred.
I haven't attempted to remediate the damage as I don't want to damage the paint."

CLICK FOR MORE »

Oberheim FPV-1 Filter Pedal Demo

Note: links to listings are affiliate links for which the site may be compensated.
video upload by a-root

via this Reverb listing

Pics of the inside below.

"From my testing I gathered the following: the two pole switch turns the filter control on (down position) or off (up position). When the filter control is on, the pedal acts like intensity or swell, and the speed is controlled by the knob. When the pole switch is off, the signal passes through with the option to either bypass for a clean signal or act as a swell pedal depending on whether the pushbutton switch is pressed (located at maximum pedal depression). This is the limit of what I could test. Please keep in mind, the pedal is sold as is.

SN 0073

I have installed two new 9V batteries, which have only been used for testing the pedal during the demo video filmed on 12/07/25. The unit has remained off since testing."

CLICK FOR MORE »

Vintage Roland MPU-401, CM-32L, CA-30, CN-20, CP-40, & CF-10 System

Note: links to listings are affiliate links for which the site may be compensated.

This one was spotted and sent in via
M Me.

via this eBay listing

1 pic of the inside below.

"Includes

Roland MPU-401 Midi Processing Unit SN 873387

Roland CM-32L LA Sound Module SN Z803461

Roland CA-30 Intelligent Arranger SN Z802892 with Roland Music Style Card TN-SC1-10

Roland CN-20 Music Entry Pad SN ZA92670

Roland CP-40 Pitch to Midi Converter with CP-40M Microphone (untested) SN Z881503

Roland CF-10 Digital Fader SN Z803213

(1)Roland Boss AC Adaptor Model PSA-120T

(2) Roland Boss AC Adaptor Model ACA-120

(1) Roland Boss AC Adaptor Model PSA-120

(1) Roland AC Adaptor Model ACB-120"

CLICK FOR MORE »

Sound Master SR-88 Programmable Drum Machine w/ Original Box

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

Slight pic of the inside below.

"Super cool OG programmable drum machine! Classic 80's vibe. Works! The box has duct tape on the corners to hold it together (before my time) and the battery pack is broken but the white electrical tape does the job. Can also run off a 6v adapter.

Overall in great condition, one of the screws on the backplate is stripped but it's included in the box."

CLICK FOR MORE »

Progress on the Roland Super JX 10 Vecoven V4 editor build.

video upload by Craig Barnes

"I've finally managed to lay everything out on the bench and install the voice boards and midi board into the CME UF-70 chassis."

E-mu Drumulator with MIDI + LinnDrum kit eproms kit

Note: links to listings are affiliate links for which the site may be compensated.
video upload by ohm_studi_ohm

via this eBay listing

Pics of the inside below.

"Classic 80s 8bit PCM drum machine, used in countless hits.

This particular unit was serviced:

- all electrolytic capacitors were replaced

- switches and pots were cleaned

- latest firmware eprom was installed (3.0)

- factory patterns were loaded

- MIDI interface was added, built using the original E-mu design. This allows you to trigger the 12 sounds over MIDI dynamically

- comes with 4x additional eproms containing the famous LinnDrum LM2 sounds. I made a video a few monthes ago comparing 2 drumulators with stock and linnDrum kit if you want to hear the difference (youtu.be/k_EuRlCi_Vk)

Works perfectly. Cosmetic it is in quite good condition with some scuffs here and there, and also 2 holes were drilled in the back from a previous owner (no idea what was the reason). Unit is 230v."

CLICK FOR MORE »

Oberheim DMX 8-Voice Drum Machine SN 822119

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

"Oberheim DMX in very good condition. Please check out the photos as there is a little crack on the red display protector along with some scratches on the unit in a couple of spots. This one has easy access to open it up and switch out the EPROMS."

Pics of the inside below.

CLICK FOR MORE »

Arp Quadra Polyphonic Analog Synthesizer Ready For Reassemble

Note: links to listings are affiliate links for which the site may be compensated.

via this eBay listing

"ARP Quadra synthesizer. Currently in parts and needs to be reassembled. Includes new illuminated sliders and touch sensor strip from Synth Chaser.

This is a project synth that I am just not getting around to rebuilding. Time to find a new home and give someone else a chance to bring this amazing vintage synthesizer back to life."

Pics of the inside.

CLICK FOR MORE »

Pics of the Inside of the New Roland TR-1000

This one is in via an anonymous reader spotted on imgur.

CLICK FOR MORE »

E-MU Systems MP-7 (Model 7760) Command Station 128-Voice Synthesizer w/ Haxorhax Expansion Cards

Note: links to listings are affiliate links for which the site may be compensated.

via this Reverb listing

Additional SYNTH CITY Listings

SN 010202549

Pics of the inside expansion cards below.

"The E-mu MP-7 “Command Station” is a powerful 64-voice groovebox packed with the Proteus-style “Mo’ Phatt” soundset, known for its hip-hop, R&B, and electronic-leaning presets. It features deep sequencing, real-time controls, and expandable ROM slots for adding entirely new sound libraries.

Built like a tank and highly programmable. Tested in great working condition, shows average cosmetic wear.

Additional expansion cards from Haxorhax ::

Rob Papen's Techno Synth Construction Yard (TeCnO)
Mauricio Balma’s Shock Treatment Sound ROM (Shock)"

CLICK FOR MORE »