ARP Quadra Polyphonic Analog Synthesizer

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

via this Reverb listing

"ARP Quadra in great working condition. Serviced regularly by Custom Vintage Keyboards in Los Angeles, this synth has been upgraded with wooden end cheeks to replace the original leather ones, a brand new aftertouch system, as well as fully recapped, and calibrated. There are a few areas with paint chips pictured, but for its age, it is in remarkable shape. Power cord included.

Due to its size/shape and fragile nature, local pickup in Brooklyn only, or can arrange hand delivery within a few hours drive for an additional cost."

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Yamaha CS30 service and external clock modification

video upload by Jörg Schaaf

"The internal sequencer of the CS30 does not sport an external sync input for the internal sequencer. Furthermore, the CS30 circuitry is designed for 15 Volt gate signals. Eurorack synthesizers are specified with 5 Volt trigger signals. The modification adds an external input at the backside of the synth. When you set the sequencer to manual mode, the external input is active. It does not replace the manual button. Instead it's adding a second sync source. That means, you can still select the starting step of the sequencer line with the manual button.

Are you looking for a synthesizer workshop or do you want to add mods to your vintage synth? Then maybe my synthesizer-service.de website is a good starting point.

https://www.synthesizer-service.de"

A Day in the Shop Ep. 11 - Rare Sennheiser Vocoder, 8-Voice Jam with Benny Bock

video upload by Rosen Sound

"Rob works on one of the rarest vocoders in the world for a super special client. Zak and Benny jam on the 8-Voice and CS-80, Benny explains some of his favorite settings on the 8-Voice. Freddie works on a Korg Trident."

EMS 256 Sequencer Repair Part 2 Re-Cap circuit cards and devising a plan.

video upload by Really Nice Audio

Really Nice Audio EMS 256 Sequencer posts

"What is the likelihood due you think I will get this sequencer fully functional? I am now able to see the memory fill up when using a key input. The hardest thing for me to work out was a strategy for the repair. Considering how old this unit is will I find many broken logic IC's?

It is hoping to play some music in September, let me know your thoughts below.
https://paymentportal.uwl.ac.uk/confe...

This is part of the Pete Townshend Synth Collection at the University Of West London

https://www.uwl.ac.uk/study/study-fac..."

EMS 256 Sequencer Repair Part 1

video upload by Really Nice Audio

Really Nice Audio EMS 256 Sequencer posts

"Join me in a quest to get this incredible sequencer back up and running.

It is part of the Pete Townshend Synth Collection at the University of West London
https://www.uwl.ac.uk/study/study-fac..."

SN 6014

Roland System 700 Modular Synth Repair | Full Teardown & Service #183

video upload by Synthchaser

"We explore the workings of the ultra-rare Roland System 700 Modular Synthesizer as we repair and service one of only 40 systems ever made!

🌐 Find me here:
https://synthchaser.com/"

Moog's Extremely Rare Synth- The Minitmoog!

video upload by synthpro

"Hey Guys,

In this video, I take you through the Minitmoog synthesizer. from my understanding this was a one year only model with only a few hundred manufactured.

Thanks for watching!
Jareth"

He Sent His LinnDrum to Bruce Forat... Here's What Happened

video upload by Brian Coyne Guitar

"I bought this 1983 LinnDrum on eBay, and after only a couple of weeks it started acting up. That's when I reached out to legendary LinnDrum expert Bruce Forat of Forat Electronics.

In this video, I document the entire experience—from Bruce's own recommendations on how to safely package and ship a vintage LinnDrum, to the repairs and maintenance he performed, to the way he carefully packed and shipped it back to me.

If you own a LinnDrum, Drumtraks, Oberheim DX, or any other vintage drum machine, you'll definitely want to hear Bruce's advice on shipping these rare machines safely. One careless shipment can cause thousands of dollars worth of damage.

Along the way, I'll show:
• How Bruce recommends packing a LinnDrum for shipment
• The repairs and maintenance Bruce performed
• How the LinnDrum looked when it returned
• Why Bruce Forat remains one of the most respected names in the LinnDrum world

A huge thank you to Bruce Forat for keeping these classic machines alive for future generations of musicians."

Rick Wakeman's Polymoog 203a Restoration

video upload by synthpro

"Hey Guys,
In this video I take you through the restoration of Rick Wakeman's Old Polymoog that now belongs to Steve. (he purchased it from Rick and has a letter of authenticity) I preserved some areas while completely restoring and servicing others to keep this a historical unit but also very much usable.

This unit in particular would have been used on the YES album, 'Going For The One'.

Needless to say this was a very exciting project for me growing up listening to Rick Wakeman/YES as well as my appreciation for Dr. Dave Luce and the Polymoog.

Special thanks to Steve for giving me the opportunity to work on this Polymoog!

Thank you Rick Wakeman, for all the inspiration you gave me as well as million of others through your music and performances.

Sincerely,
Jareth

P.S- here are a few videos with Rick and the Polymoog:"



Playlist:

1. Yes - Going For The One Sessions Part 15
2. Yes - Wonderous Stories (Official Music Video)
3. POLYMOOG PROMOTIONAL FILM PT.1

Siel DK80 Synthesizer Repair - Weird Power Supply Issue

video upload by gstormelectro

"Audio + Video by G-Storm Electro c. 2026

Today I've got a Siel DK80 with an issue. Both 7-segment displays are very dim, and also the front panel LEDs are faint. Seems like a power supply problem. What I noticed is when I depress the power button fully to turn it off, the display and leds come back to full brightness. Seems that the power switch might be going out. Let's teardown the synth and replace the switch to see if it fixes the issue."

G-Storm Electro:
MUSIC https://gstormelectro.bandcamp.com/
BLOG http://gstormelectronica.blogspot.com/
LISTEN/DOWNLOAD http://soundcloud.com/gstormelectro
REVERB https://reverb.com/shop/gstormelectro

Roland Juno 106 Synthesizer - Serviced - New Voice Chips - Signed by Kip Winger

Note: links to listings are affiliate links for which the site may be compensated.
Dead Roland Juno 106 Repair - Synthchaser #178 video upload by Synthchaser

via this eBay listing

CLICK FOR MORE »

Synclavier II Hardware In 2 Minutes

video upload by Synclav com

"This is year number 27 for Synhouse.

Synhouse has fully restored and shipped many, many dozens of systems in the last three decades and this work continues in 2026.

Shown here is the testing of a Synclavier computer bin card set without needing the synthesizer voices yet (it ended up with 8 original style mono Synclavier II synthesizer voices). This Control Unit is used as a test box at Synhouse. Once testing was completed, the cards were moved to a freshly restored ATS 3-level enclosure chosen by the client.

Relatively few Synclavier IIs were made, and this is the super vintage hardware setup.

Synhouse stocks these systems and parts and Synhouse manufactures this hardware and has them in the Synclavier store on the Synclav.com website.

Video copyright 2026 Synhouse Multimedia Corporation"

Mike's Multimoog Restore/Demo

video upload by synthpro

"Hey Guys,
In this video, I bring you along the adventure of a sick little Multimoog that now has a full bill of health. Thanks for watching!

Sincerely,
Jareth"

Arp Avatar Repair

video upload by Really Nice Audio

"You must check out Alex balls superb video demonstrating the true power of this Arp Avatar" [watch it here]

Toto’s CS-80s: Lost & Found, restored at Rosen Sound, full demo

video upload by Rosen Sound

Modified Elka Wilgamat III v4 Demo + Individual Outs 2025

video upload by mysterycircuits

"Quick demo of modified Elka Wilgamat III - 2025 Mystery Circuits, LLC"

Quick Repair and Tour of an Emerson Modular System

video upload by Rosen Sound

"Rob takes you on a quick tour of an Emerson Moog modular he fixed up for the Moog foundation in time for the 2026 winter NAMM."

Property of the late Gene Stopp. Also see The New Emerson Moog Modular System Is Real.

EMS Synthi 100 Repair Part 2 Belt and Braces Approach to bring back to life a beautiful linear PSU

video upload by Really Nice Audio

Part 1 here

"Join me in this second video to repair a classic EMS Synthi 100.

This synth is part of the Pete Townshend collection at the University of West London
https://www.uwl.ac.uk/study/study-fac..."

EMS Synthi 100 Diagnosis. What could be causing this poor synthesiser to sound poorly?

video upload by Really Nice Audio

Yamaha DX7 Repair & Overlay Replacement

video upload by Synthesizer Keith

"In this video I replace the overlay panel on a Yamaha DX7, and do routine repairs and maintenance.

00:00 Play In
00:09 Introduction
02:32 Disassembly
03:05 Grey Matter E Upgrade Board Removal
03:39 Battery Replacement
04:54 Grey Matter E Upgrade Board Re-installation
05:32 Tact Switch Replacement
07:42 Overlay Panel Replacement
10:39 Switch PCB Shims
11:26 Keyboard Cleaning
12:20 Mod and Pitch Wheel Cleaning
12:48 Re-assembly
13:19 Conclusion
13:48 Play Out"