Oberheim DX 6-Voice Drum Machine w/ MIDI

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video upload by Paul White

"Running through some basics of operation for the Oberheim DX drum machine. Programming a sequence, changing tempo, tuning the voices and testing the various audio output jacks."

via this listing

Pics of the inside below.

"This Oberheim DX has just been serviced by Paul White of Electrongate. He just finished it this week and it ships from Electrongate.

Everything is freshly tested and brought to spec. The unit has some exterior dings, but it is in Excellent shape overall. Guaranteed satisfaction!

Paul added the MIDI option and walnut cheeks to finish off the refurbishing.

Paul is the absolute best guy to work with. All the photos are his. He even made a Youtube video to show post refurbished operation."

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Roland CR-78 w/ Kenton KADI Port

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"Fully recapped, professionally serviced, missing a couple of potentiometer caps as you can se on the pictures, has Kenton KADI port built in, and Kenton Midi to Kadi device is included in the price."

Pic of the inside below.

See this post for a pic of a Kenton KADI.

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Moog Memorymoog Plus

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via this listing

Pics of the inside below.

"Moog Memorymoog Plus with Midi polyphonic analog synthesizer. It's in great shape and 100% fully functional, completely gone through and serviced as needed (with many hours and high costs). If you are looking for a Memorymoog that's been well taken care of, this is the one. This will be safely packed for transit in a custom made box.

Work performed includes:
- replacement of all the electrolytic capacitors
- replacement of all the cmos ICs
- replacement of the OPAmps of the dmux board
- replacement of the socket connectors
- cleaning of all the tactile switches
- cleaning of the potentiometers
- cleaning of the key contacts
- replacement of panel ribbon connectors
- cleaning of the jack sockets
- replacement of PSU with efficient lower heat PSU + Rosen Sound stereo mod Stereo Outs (utilizes program advance and backwards jacks for stereo outs so no drilling required, Normal Mono outs work as they should too
- factory calibration"

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Dynacord ADD-one + ADD-drive RARE PAIR

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ADD-one Audio Demo video upload by morbank01

Playlist:
ADD-one Audio Demo
ADD-one Diagnostic Display and LED Test
ADD-one Easter Egg

via this listing

Two pics of the inside below.

"Dynacord ADD-one + ADD-drive, Dynacord’s dynamic sampling duo! This combo makes for an incredibly powerful hardware synth/sampler with unparalleled capabilities for its time.


NOTE: Other recent listings only include the ADD-one, but if you are reading this you probably know that the increasing hard to find ADD-drive unit is essential if you want to be able to sample your own sounds.

So if you have been looking for a complete ADD-one/ADD-drive don’t sleep on this rare opportunity!

These two specific units were purchased in 2016 from Wavemeister AUT (receipt available on request). Both units are in incredible cosmetic condition for their age and are working as they should. Used in a smoke free, climate controlled studio and never gigged. The build quality on both units is top notch and all knobs and buttons feel great. ADD-one’s display is original, but it is bright and easy to read (see pics), although not from all angles, but this was never the case even when new. Serviced by Audio Rehab, CA (Greg Granieri) in 2019 (receipt available on request). All contacts, pots, jacks and switches were cleaned. And all 23 button contacts have recently been re-cleaned and are working as they should.

There is a very slight whine sound when powered up which can be heard at the outputs. I am no expert, but it’s possible this could be resolved by replacing the capacitors in the power supply. It has never bothered me enough to address so I will let the next owner decide if they feel this is necessary.

The ADD-one is running firmware v2.22 and passes all diagnostic tests and sounds fantastic (see video link below).

There are a few, very minor blemishes and scuffs on both units, with one small dent on the top panel of the ADD-one (see pic), and some erosion on the top edge of the left rack ear of the ADD-drive (see pic). However the front panels are mostly pristine, with only one tiny, tiny mark on the ADD-one visible (see pic), and some wear to “Dynacord” text on ADD-drive (see pic). Very, light rack rash on both units (I hit Reverb’s image limit but additional pics available on request).

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1986 Dynacord ADD-One (Advanced Digital Drums) - Serviced w/ LED New Screen SN 10032

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Additional SYNTH CITY Listings

Pics of the inside below.

"Dynacord ADD-One (advanced digital drums) is a German-manufactured, American-designed drum module that was first released in 1986. Uses recorded samples (stored on internal Eproms) to produce its sounds through analog voltage-controlled envelopes and analog filters with resonance, to self-oscillation per voice.
Other sounds can be loaded via with the optional 'Add-One Drive'. You can sample any recorded sounds into the sampler via the microphone/line input with on-board compressor. *The 'Add-One Drive' expansion is not included with this sale.

Beyond rare. Our in-house repair tech just serviced this unit:

-Replaced filter caps and reattached bridge rectifier
-Cleaned all power supply connectors
- Removed and cleaned leads to several ICs
-Cleaned connector/pin headers between memory expansion PCB and main PCB
-Cleaned dirty controls
-Replaced (2) failed operational amplifiers in output mix section
-Installed NEW replacement LED screen"

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SLM CONCERT SPECTRUM String Analog Synthesizer

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via this listing

Pics of the inside below.

"This SLM Concert Spectrum string synthesizer keyboard was produced by Welson Synthesizer from 1975-76. Italian-made, stereo analog string/brass/piano synthesizer was made famous by Richard Tandy of The Electric Light Orchestra and Gregg Rolie of Journey.

The Concert Spectrum features:

61 keys (C2 - C7)

Split (between E4 and F4) that allows different sounds to be set for lower and higher keys

5 sound presets that can be layered (Cello, Violin, Horn&Trumpet, Piano, Harpsichord), with on/off buttons

10 volume sliders, 2 for each sound, setting the level of each preset in the total sound, 1 for each split section

4 decay sliders (actually: release sliders), 2 for the sustained section (Cello, Violin, Horn&Trumpet) (1 for each split section), 2 for the percussive section (Piano, Harpsichord) (1 for each split section)

Concert Effect

Stereo output (2 unbalanced mono jack outputs, with individual volume controls) on the back

2 connectors for optional volume pedals

Pitch (tuning) potentiometer

This synthesizer will need to be serviced to be fully functional. It powers on and produces a quiet sound for some of the sound presets but not all. The power cord has some fraying near the plug, and it will need repair as well. Pots and sliders have been scratchy when tested but not consistantly."

Tiptop Audio - Buchla 296t Spectral Processor SN 2341408004893 w/ Original Box

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Pics of the individual band cards on back below.

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PAIA DIY MODULAR SYNTH w/ Docs

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SEQUENTIAL CIRCUITS Prophet 2002 Rackmount Sampler

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via this listing

Pics of the inside below.

"Excellent cosmetic condition.

Removed from an in use rack, removed from a closed music school."

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Inside a Behringer UB-Xa

Two pics in via María Aguilar.

Note the 16 rows of individual voices.

Studio Electronics MidiMini

video upload by Vykaar Tones

"As these are quite rare I thought I would make a video while I was testing this one after a repair and service. It is basically a minimoog in a rack with midi and more features - sounds great... played from my trusty and rather dusty Arturia Keystep. Please click thru to get the various tones as this is quite a long video for Minimoog fans and nerds."

Robert's Memorymoog Plus Demo (by synthpro)

video upload by synthpro

"This is a video going over a very nice Memorymoog Plus I restored for Robert. This unit had a few failures but went on and gave it a proper restoration so it will hold up for another 40 years.

Thanks for watching!

Sincerely,
Jareth"

REPAIR and PLAY Episode 1 : * Novation Peak Synthesizer *

video upload by Big Mag

"Teardown and repair of a Novation Peak polyphonic synthesizer. Includes synth jam using Novation Peak + Vintage Oberheim DMX. Sequenced by Keystep PRO."

ROLAND GR 700 GUITAR SYNTHESIZER Display Board And Bezel

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via this listing

"All buttons click and bezel is in good physical condition. Some slight scratches"

Studio Electronics MidiMoog Rackmount Vintage Minimoog w/ MIDI Monophonic Analog Synth

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via this listing

Pics of the inside below. You can see the original Moog boards.

"Studio Electronics MidiMoog! Rackmount Minimoog made with original late-60's Moog Minimoog cards (not to be confused with the Studio Electronics MidiMini which does not utilize original Moog cards). This sounds incredible. The analog depth and character here cannot be matched w/ a plugin or modern alternative!

Not pictured, but included, is a 1U Studio Electronics rack unit which supplies MIDI connectivity and tuning control. A cable is included to connect the MidiMoog to this rack unit."

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Moog Muse Desktop Test Machine Spotted

This one is in via an anonumous reader.

If you click on the image and zoom in you will see what appears to be a desktop test machine of the upcoming Moog Muse and some circuit boards. Also note the boards on the table in the foreground. They appear to match the boards in the test machine w/ keyboard on the desk to the left of the desktop unit. A little bit of synth history in the making.

Additional Moog Muse posts

360 Systems Digital Keyboard SN B-311

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via this listing

One pic of the inside below.

"One of the earliest multi-sampled synthesizers. Less than two hundred were produced between 1982 and 1984.

This particular unit is in very good condition, and was used for an in-depth sample pack, so you can be sure it functions very well and sounds fantastic. All patches & sounds work. All outputs work. All buttons and knobs work.

Even better, this unit doesn’t have the piano sound that takes up so many EPROMs. It comes with 20 of the best patches:

Cello, Strings, Clarinet, English Horn, Flute, French Horn, Muted Trumpet, Oboe, Saxophone, Trombone, Electric Guitar, Nylon Guitar, Clav, E Piano, Trumpet, E Bass, Slap Bass, Mallet, Timpani, Vibes

The sound of the 360 is a combination of beautifully captured samples and the inherent lo-fidelity crunch of EPROMs passing through a CEM3320 analog filter. Its sound is comparable to that of a Mellotron, Chamberlin or Orchestron but has higher fidelity, and the 360 has more parameters and options.

Issues:
There are some issues with key contacts. Some keys double trigger. We’re happy to clean this, which will very likely resolve the issue.

Cosmetically, it's in amazing condition. Very clean and pristine.

Cosmetic issues:
Some keys aren't level. Some dirt on the keys. Random small scratches and wear around the unit. But overall, in wonderful cosmetic shape."

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Avalon Service Note 12: Adding Filter PWM input (updated)

video upload by Abstrakt Instruments

https://abstraktinstruments.com/

"Avalon Service Note 12: Adding Filter PWM input

Please note: This video was updated on July 16 after finding Resistor R328 was the incorrect value.

If you have an Avalon from the 6th run your unit may be missing a surface mount resistor relating to the filter PWM input. The result is that the filter CV offset feature and MIDI filter control are not working. This issue affects about 25% of 6th run units, approximately 80 units total.

Serial Numbers Affected: AVxxxx201704 between 0930 and 1044 (i.e.from AV090201704 to AV1044201704)

Please also see the service note here:

https://abstraktinstruments.com/conte... [PDF]

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Welson Syntex (1977) restoration

video upload by M&M

"Hello everybody my Hobby it's restore the old Combo organ and Synth.
In this video i show you the restoration and test of Welson Syntex."

Waldorf Microwave Rackmount Wavetable Synthesizer REV.B (CEM 3387) SN 9543883

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via this listing

Additional SYNTH CITY Listings

"Waldorf Microwave REV B loaded with the original CEM 3387 chipset. This unit has plenty of rack wear, but it fully functional otherwise. This unit is 230V and will require a setup down converter for North American operation. Fantastic sounding unit!"

Pics of the inside below.

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