Two Vintage Moog Sonic Sixes

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video upload by Synthchaser

One via this Reverb listing, also on eBay

2nd via this Reverb listing, also on eBay

Descriptions follow.

1st Sonic Six: "The Moog Sonic Six is a rare, portable analog synthesizer with classic Moog tone and ladder filter, featuring dual VCOs, sample-and-hold, ring modulation, and a built-in speaker—all housed in a rugged suitcase-style design perfect for studio or stage. Its unique sound-shaping capabilities including X/Y modulation, and vintage character make it a prized collector’s piece and a powerful tool for experimental or classic analog synthesis. While this synthesizer is often offered by sellers at a "high on crack" price, I am pleased to offer this one for less than half of what some delusional synth dealers are trying to get for it.

The synthesizer is in good condition, but the original "Moog" logo sticker on the outside was peeled off. The power switch does not illuminate when the synthesizer is powered on. The synthesizer uses a standard IEC power cord, and one will be included. Please see photos.

This Moog Sonic Six has been serviced by Synthchaser in August 2025. Work done included:

Cleaned switches, pots and sliders
Refurbished keybed - new bushings, cleaned bus bars & contacts
Tuned & Calibrated Synthesizer"

2nd Sonic Six: "This vintage Moog Sonic Six Suitcase Analog Synthesizer powers on and makes sound, but is being offered as-is at a discount due to cosmetic and functional issues. The A, X, and Y oscillators and the Moog Ladder filter appear to be working. This can be a great opportunity for someone willing to put a little work in to get this rare synthesizer below market. The synth is being sold as-is for parts or repair, with no returns.

Please see this video showing the functional status of the synthesizer. : [video above]

Issues I noticed (you may find other issues, but the synthesizer is still being sold as-is with no returns):

Cosmetic: A power cord has been hardwired to this unit in place of the power inlet. The exterior of the case is in rough looking condition and some screws are missing and things feel loose. The synthesizer is missing all knobs and switch caps. Some of the keys are stained. 2 rubber feet are missing, so the case needs something behind it to stay open when in use.

Functional: Oscillator B appears to be dead. The ring modulator appears to not be working (perhaps due to oscillator B not working, ring mod was not tested with external input). Key contacts are dirty and not working well, bushings need to be replaced. The contour generator appears to be broken. The Contour/Pitch Control pot for the filter was replaced with a pot that doesn't extend fully through the panel, so you can't use it. Pots, sliders and switches need cleaning. Calibration needed."