Arp Odyssey MK2 2813 Analogue Synthesizer

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via this auction

"It has been recently (July) fully overhauled by James Walker of Synth Repair Services. It has had all of the input and output sockets replaced with new SwitchCraft sockets. The high level output, which is usually on a phono socket, has been switched over so now the high output is on 1/4" standard jack. It has had a Filter CV input socket fitted to allow CV control of the Low Pass filter, leaving the pedal input free to Osc 2 pitch etc.

In addition it has a new UK power supply, new trimmers, Op amps, keyboard bushes and been recapped. All of the sliders, which with age can get stiff, have been stripped down, cleaned out and relubbed and work like new. To finish it off it has new slider caps fitted and been completely recalibrated and tuned..."

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Groove Electronics Stinger - Vintage EDP Analog Synth

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via this auction

"This Stinger has been repaired by James Walker at Synth Repair Services in the U.K. (both while at FX Music Control and subsequent). Unfortunately, I do not have access to a MIDI keyboard or appropriate 1/4" out for audio, so I am offering my Stinger as 'untested' as I cannot properly play and test it now. However, the power comes on when plugged in.

Included with the Stinger are an assortment of ICs that can be used in the future if needed. I collected spares 'just on case', and will send printed copies of the operations manual and other notes made wile examining the innards."

Pics of the inside below.

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Yamaha CS 50 Polyphonic Synthesiser

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via this auction

"Rare Yamaha CS50 4 voice Polyphonic Analogue Synthesiser.

Serviced by James Walker of Synth Repair Services so works perfectly.

Service included new trim pots fitted on the Voice boards so it stays in tune and all sliders were cleaned as required.

An electrical safety test was also carried out...

The Aftertouch is working perfectly.

The sound is excellent as you would expect from the CS 50 which is in the same range as the Yamaha CS 80 flagship analogue model.

The synth is in its own tolex case with the legs and music stand stored in the lid."

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ROLAND SH-5

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via this auction

"Offered for sale is this Roland SH-5 in exceptional cosmetic condition and perfect working order.

It's an awesome synth and quite unlike many of the other Roland SH series - more like a compact System 100.

There are a few scuffs and minor nicks in the outer casing, but otherwise this synth is in amazing condition (please see detailed photos below). It has had one owner from new and has obviously been very well cared-for. The pots/sliders feel like new - it would appear to have had very little use.

It has been checked over, tuned and PAT tested for electrical safety by James Walker at Synth Repair Services and is in excellent working order - all pots move smoothly and noiselessly and all pots, switches and knobs function exactly as they should - it is a joy to play and program..."

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OSCar Synthesiser SN 0810

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via this auction

"This is a great opportunity to get hold of a unique, rare and classic British Synth.
Cosmetically very clean, this superb synth is Version M2 (MIDI) with sounds that will inspire musicians, synth freaks and sound designers alike!
The synth has recently been beautifully overhauled by James Walker at Synth Repair Services with the replacement of various components including:

1 New OSCar Midi OS EPROM Ver OM2a
1 New Back up Battery
1 New Mains Plug
28 New Pots
1 New Power Supply Parts( regulators and Capacitors)
1 New 40 Way DIL Socket
1 New 40 Way Component Header
1 New 24 Way Component Header
1 New 24 Way DIL Socket
2 New Knob Caps

A fairly comprehensive overhaul I'm sure you'll agree, giving the synth as pretty 'clean a bill of health' as is possible, (receipt available on request). All it needs now is a good home!"

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Oxford Synthesizer Company OSCar SN 0691

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via this auction

"Offered for sale is this Oscar in very near mint cosmetic condition and perfect working order.


It is incredibly clean for a synth that's nearly 30 years old and is without doubt the best one we've sold (see detailed photos below). There is minimal wear to the paintwork, the keys are shiny and clean, the rubber casing is exceptionally good with no obvious signs of perishing - the rubber parts are undamaged (most Oscars suffer from these parts breaking off and it's uncommon to find one with no damage).

Our definition of 'mint' is 'as it left the factory' - clearly very few if any used synths of this age can be described thus; this OSCar truly is in near mint condition.

It has just been serviced by James Walker at Synth Repair Services (one of the UK's most respected vintage synth techs who has a particular fondness for OSCars) and he's given it a clean bill of health. He also looked after it for the previous owner: it's been very well-maintained and has had a good deal of work carried out both in the recent service and over the past 8 years. As a result, we don't believe you will find a better example of this iconic British synth anywhere else.

Cosmetically, it has just one issue that we can make out: the low F key is slightly yellower than the others; it may have been replaced at some point in the past. It has been PAT-tested for electrical safety.

At 30 years old OSCars generally need a few things replacing/improving if they are to continue working as intended - especially the Midi board connections which can be very unreliable, resulting in synth that can stop working when moved from one room to another, never mind being sent by courier. The original control pots tend to become unreliable and often need replacing.
Everything necessary and advisable has been done to bring it up to top spec and make this amazing vintage synth as reliable as possible: it should reach its new owner in perfect working order.

It's serial number is 0691 and has the midi board and latest OS Eprom (OM2a)..."

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ROLAND TB-303 Bass Line + case + PSU SN 242000

Note: Auction links are affiliate links for which the site may be compensated. via this auction

"Offered for sale is this amazing Roland TB-303 in original condition, together with original carry case and (for UK buyers) a Roland power supply.

It has just been serviced by James Walker at Synth Repair Services, is in perfect working order and sounds amazing. The front panel is in excellent condition (please see 31 detailed photos below): there are some marks to the paintwork - especially to the rear panel where some of the original finish has been lost, but overall this is in exceptional condition.

The service comprised of replacing the tact switches; replacement of the mini and 1/4" jack sockets and the DC input socket; re-calibration. No other internal parts were replaced - all transistors and pots are original so it sounds exactly as it should.

We also have an as-new Phillip Rees MDS Midi-Sync24 Converter which can be used to trigger the 303's patterns via Midi; please get in touch if you wish to purchase this alongside the 303.

It is in perfect working order - all pots move smoothly and noiselessly and all pots, switches and knobs function exactly as they should - it is a joy to play and program. Internally it is very clean and there's no evidence of any past leakage in the battery compartment.

(It is always possible with vintage equipment that crackly pots/sliders may develop over time when equipment has not been used - even during shipping - this can usually be easily rectified either by a few turns or in extreme cases, with suitable switch-cleaning spray)."

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OSCar Synth

Note: Auction links are affiliate links for which the site may be compensated. via eBay UK
"This is a great opportunity to get hold of a unique, rare and classic British Synth.
Cosmetically very clean, this superb synth is Version M2 (MIDI) with sounds that will inspire musicians, synth freaks and sound designers alike!
The synth has recently been beautifully overhauled by James Walker at Synth Repair Services with the replacement of various components including:

1 New OSCar Midi OS EPROM Ver OM2a
1 New Back up Battery
1 New Mains Plug
28 New Pots
1 New Power Supply Parts( regulators and Capacitors)
1 New 40 Way DIL Socket
1 New 40 Way Component Header
1 New 24 Way Component Header
1 New 24 Way DIL Socket
2 New Knob Caps

A fairly comprehensive overhaul I'm sure you'll agree, giving the synth as pretty 'clean a bill of health' as is possible, (receipt available on request). All it needs now is a good home!"

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KORG POLYSIX Analogue polyphonic synthesizer

via this auction
via this auction

"This synth was fully serviced by James Walker of Synth Repair Services in November 2011. (I can provide receipt for this work on request). You will receive a fully functioning Korg Polysix with no leaking battery timebomb. James replaced the old battery with a safe modern equivalent."

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Korg MS10 Analogue Synthesiser

via this auction

"Recently serviced by James Walker of Synth Repair Services including complete re-cap, new electrolytics, new power supply regulator, keybed cleaned, Jacks inserts cleaned and recalibrated..."

SN 133411

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Oxford Synthesizer Company OSCar w MIDI

via this auction

SN 0009

"It has just been serviced by James Walker at Synth Repair Services and he's given it a clean bill of health. After nearly 30 years OSCars need a fair few things replacing/improving if they are to continue working as intended - everything necessary has been done to make this amazing vintage synth as reliable as possible.

It is a very early model - serial number 0009 - but has Kenton Midi and has had the OS Eprom upgraded to the latest version (OM2a)."

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EDP Wasp and EDP Spider with Original Docs

via this auction

"Vintage rare EDP Wasp and EDP Spider (both working) with manuals and cable. These item are fully working and have been recently repaired and serviced by James Walker synth repair services in Stoke on Trent.

This includes:
EDP Wasp
EDP Spider
EDP Wasp manual ( Very good condition)
EDP Wasp performers manual (acceptable condition- notes on one page)
EDP Spider instructions page (acceptable)
Connection cable (from wasp to spider)

The EDP Wasp synth has been fully cleaned and serviced (no scratchy pots) and the keyboard is in a beautifull clean condition with no fading. There are two cosmetic chips on the back corners as visible in the photographs and do not effect the sound. Also the battery cover is missing. apart from this it is a fully working, a beautifull example of an EDP Wasp.

The EDP Spider is a sequencer for the Wasp, it is incredibly rare. It has been checked and is fully working, serviced and cleaned."

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VEMIA - Moog Vocoder

via this VEMIA auction
"Very rare and sought-after, and in excellent working condition, serviced last week by James Walker at Synth Repair Services. 110/240V switchable. James' report: 'As you can see the unit is not in good cosmetic condition but is 100% functional (though the switch labelled Hiss Buzz has an extra stop (i.e. 4 instead of 3 ) which does nothing). The pics should show the damage to the rack ear on the right hand side (someone has glued it back on and painted over the crack). It seems to hold but I haven't racked it up. The other ear is missing the handle and as seen from the moog logo looks like it is a right hand panel on the left hand side.' These side panels were a clever design which was interchangeable, so maybe spares are still available. There is some scratching to the bottom left of the front panel - see pic - but otherwise the front panel is much much better than the sides! Copy manual can be included."

Crumar Spirit analog synth

YouTube via buchla300

"Great little synth I just got back from being repaired by James Walker at Synth Repair Services. Don't have much experience of it, so just me noodling. I like it towards the end (after 5 minutes) where I add S&H to the filter. Very flexible with 2 filters and some great modulation possibilities and a pretty funky Arpeggiator." Odd note: this one sounds a bit like my Waldorf Pulse Plus.