MATRIXSYNTH

Erik Norlander's Korg Maxikorg Maxi-Korg DV800 Vintage Synthesizer, Kenton CV, Custom Wood, Soft Case

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video upload by moogfoundation

"A rare and powerful dual monophonic synth from the early '70s.
Everything works great; very good condition for its age!

The Korg Maxikorg (also known as the DV800) is one of Korg’s earliest analog monsters, featuring two fully independent synth voices that can be layered, split, or run in duophonic mode. With rich oscillators, aggressive filtering, and a truly wild modulation section, this thing is a playground for experimental sound design, dirty basslines, and vintage leads.

Includes soft case in great shape, and is a perfect fit for this unit.

Highlights:

Two completely separate synth engines, each with its own VCO, VCF, VCA, and envelope
Kenton CV upgrade
Beautiful custom built dark walnut cabinet
Switchable mono, dual, or duet modes
Powerful resonant filters and per-voice modulation
Preset tone selectors with full manual override
Early Korg analog tone: warm, raw, and full of character
37-note keyboard
Famously used by Vangelis and The Who, the Maxikorg stands out for its unusual architecture and expressive possibilities. It’s a cult classic for collectors and sound designers alike.

30% of the sale supports the Bob Moog Foundation, preserving the legacy of analog innovation and inspiring future generations."

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Erik Norlander's Korg Mono/Poly Analog Synthesizer, serviced, with case SN 378257

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via this Reverb listing

"Very good condition, serviced by Rosen Sound, and includes a light-duty Tuff Case for easy transport!

Cosmetic notes: small chip in wood veneer edge under keybed, and the mod wheel shows a bit of wear. Both of these issues are shown in the images.

Released in 1981, the Korg Mono/Poly is known for its four VCOs, flexible modulation options, and unique mono/polyphonic switching, making it a versatile beast for both fat unison leads and unique, syncopated arpeggios. Its cross-modulation, oscillator sync, and deep routing options open the door to wild textures and sound design experimentation.

Specs & Highlights:

4 analog VCOs with independent tuning
Mono, Poly, and Unison modes
Crossmod, oscillator sync, and flexible LFO routing
Built-in arpeggiator and chord memory
Classic Korg 24dB/octave low-pass filter
Full MIDI retrofit kits available (not included, but easily added)
Used by artists like MGMT, Chromeo, and Jimmy Edgar, the Mono/Poly is a staple of vintage synth setups and prized for its unique voice architecture and beefy tone.

This unit was serviced by Rosen Sound, a trusted name in analog synth repair, so it’s running great and ready for action. Includes a Tuff Case (light-duty) to keep it safe during travel or storage.

30% of proceeds will benefit the Bob Moog Foundation, helping inspire future synth pioneers and preserve electronic music history."

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Sequential Prophet 5 Rev3 61-Key 5-Voice Polyphonic Synthesizer w/ MIDI Kit

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via this Reverb listing

Additional SYNTH CITY Listings

"The Prophet‑5 (Rev 3.2) captures the essence of that classic Sequential tonality—warm, bold, and musical—with the resilience of newer chipset reliability. Whether dialing rich analog basses, lush pads, or punchy leads, this unit delivers that unmistakable vintage vibe. Fully serviced w/ Wine Country MIDI-kit, it’s ready for studio or stage. ****Synth has one non original knob.

Service notes:

-Replaced all tantalum caps connected to power supply rails
-Replaced Timer IC
-Replaced z80 CPU
-Replaced internal memory battery
-Cleaned and resoldered lots of connectors and molex headers between panel and processor
-Cleaned buss wire and j-wire key contacts
-Cleaned pots and resolderd various panel components
-Cleaned IC pins and sockets on cmos logic ICs on processor board
-Cleaned pins and reseated RAM and ROM ICs
-Reloaded factory presets
-Reseated ribbon connector between processor board and midi retrofit board
-Checked calibration and adjusted as necessary
-Replaced 4016 cmos logic IC
-Resoldered power supply buss rails on processor and voice boards

Bench tested for several hours and readjusted calibration as necessary."

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Sequential Prophet 5 Rev 3.2 61-Key 5-Voice Polyphonic Synthesizer (Serial no. 5418)

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via this Reverb listing

Additional SYNTH CITY Listings

"The Prophet‑5 (Rev 3.2) captures the essence of that classic Sequential tonality—warm, bold, and musical—with the resilience of newer chipset reliability. Whether dialing rich analog basses, lush pads, or punchy leads, this unit delivers that unmistakable vintage vibe. Fully serviced, ready for studio or stage. (Serial no. 5418)

Service notes:

-Replaced all tantalum capacitors associated with power supply rails
-Replaced Z80 CPU and its IC socket
-Replaced 5 MHZ crystal OSC and TTL clock IC
-Cleaned and resoldered molex headers between panel boards and processor board
-Replaced all pratt reed key bushings and aligned keys
-Cleaned keybed buss wire and J-Wire key contacts
-Replaced internal memory battery
-Replaced cmos IC in tape load circuit
-Reloaded factory presets
-Checked all calibration and adjusted as necessary
-Bench tested for several hours and then rechecked all calibration
-Cleaned panel and keys"

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ASM Hydrasynth Deluxe

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Additional SYNTH CITY Listings

"ASM Hydrasynth Deluxe, tested in perfect working condition. Includes Gator gigbag, user manual and original power supply."

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Korg PS-3200 Polyphonic Synthesizer SN 210231

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via this Reverb listing

This one was listed back in 2011 and 2010.

"This PS-3200 was fully functional until about two years ago, but it has not been tested recently as I do not currently have the power cable and keyboard. (It should be possible to operate the unit by connecting a compatible power cable and installing a Kenton MIDI kit.) All internal components and parts remain original, as shown in the photos. Therefore, it is being sold as-is, with the understanding that some adjustment or servicing may be required after delivery."

Pics of the inside below.

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