If you are a tech or know of one that should be on the list, email me - it's matrixsynth at gmail.com.
Only submit those you can recommend or know are recommended by others.
Mike Overacker's list on arpodyssey.com here.
http://www.synfo.nl/pages/synthrepair.html - List of techs around the world
Kurt's Amps & Keyboards
Perfect Circuit Audio
Wine Country Productions - everything Sequential Circuits
Analog Synth Service (Greg Montalbano) - Prophet 5 Specialist & more.
This Old Synth (Chris Hewitt)
Audio Design and Service
On The Bench
EPR Pro Audio Electronics - via Subtronik: "Been to them a few times to service my K2000 and never was dissatisfied."
SDMachines - "Since 2005 I've been customizing and modifying and repairing 80's, pre-80s drum machines, synthesizers having limited syncing capabilities from their original manufacturers..."
CMS - Cirocco Modular Synthesizers - ARP specialists but Moog and, EMS also listed.
A Sound Education - via ./luther: "Steve is the tech here, formerly of Midwest Music Menders. Very good with synths."
Thesis Audio Service - Mike Metz
vansickle audio - 573.823.4379 - via spunkytoofers: "vansickle is just a little guy in the midwest but he's a really cool dude that will talk shop, does lots of cool custom work and cabinetry, and will be able to work on just about any vintage synth.. he's had some interesting vintage pieces come through his shop that he's sucessfully repaired.. he's a little bit of an anomoly for the middle of missouri which is also middle of nowhere in terms of synthesizers."
Portland Custom Shop - Synapse Audio Systems
SECRET SERVICE - 541-2292 - via spunkytoofers: "i think secret service changed their name due to problems with the name but i have used various equipment that people have sent in to them to get repaired including old wurlys, the old conn electric band, amplifiers, etc."
RetroLinear in North Wales
The Analog Lab
Switched On in Austin, TX! 512 782 8806
Condor Electronics in Fremont - Peter Toms
Ramcur in Montreal
Rick Smith in Vancouver - echo7even at yahoo.com
Brian Dekok in Ottawa - brian_dekok at yahoo.ca
Synth Repair Services
SynthesizerServiceDepartment in German - via Till Kopper: "I can recommend SynthesizerServiceDepartment in Germany close to the home town of Waldorf synths. The name behind this company is Achim Lenzgen. He used to be one of the few technicians here in Germany able to fix a PPG wave in the late eighties. I had to contact him often and we shipped individual boards of my PPG waves back ad forth several time. Before he started his own business, he was the tech behind the Synthesizer Studio Bonn which used to be THE synth shop in Germany for many years."
Studio Repair (Niko Riehm) from near Frankfurt/Main (btw: extremely interesting his picture archive)
SND (Sebastian Niessen) in Munich
Xtended in Berlin (that is, where jomox split off)
http://www.ampology.de in Hannover (the website is in german only). via Florian
http://www.sequencer.de/synth/index.php/Synthesizer_Repair - list of tech on sequencer.de
www.virtual-music.at (Alexander Guelfenburg) in Austria
gotharman in Denmark
MOS-LAB in France
The Laboratory of Sound in Netherlands (featured in this post)
Saint Eric in Netherlands - Arp Specialist
List of Techs in Norway - via Rune: "I can at least vouch for Service Partner Instrument Workshop, Oslo where I have recently got some gear repaired myself. I see that Locomofon, Oslo may not be accepting new orders at this time, but may be worth mentioning still."
Synthoma in Spain
phono1337 (dinsync) in sweden
www.defekt.ch in Switzerland
Synthorama in Switzerland
Sintetizadores - Hernan Baldi - Buenos Aires
Australia and New Zealand
Secret Life of Synthesizers
Dogmatek (Tim Prebble)