MATRIXSYNTH: Rare Triadex Muse Digital Synthesizer with Matching External Speaker


Thursday, June 12, 2025

Rare Triadex Muse Digital Synthesizer with Matching External Speaker

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via this eBay listing

Video at the listing while up.

"The Triadex Muse is an early sequencer-based digital synthesizer designed by Edward Fredkin and Marvin Minsky at the Massachusetts Institute of Technology in 1969 and produced in 1972. There were only 300 or so made and hence are very rare. Included with this Muse is the optional External Amplifier/Speaker accessory which is even harder to find.

Condition: The Muse and external speaker were tested - see the video. The basic functions on the Muse work fine. The volume on the External Amplifer works fine as well. Due to my lack of knowledge on how to do so, I did not test the EXT PRE, EXT IN and OUT, nor the KEYBOARD switch on the Muse back. Obviously the EXT SPKR input works fine. On the front, I didn't test the REST and EXTERNAL switch positions.

This Muse was stored in Grandpa Ed's crawl space for the last 40 years. The brushed aluminum is a bit dirty. I cleaned it with mild soap but didn't want to get too aggressive so I'm leaving the restoration to the next owner. There are scratches but nothing too bad. The wood is in good shape but again, scratches. There's a small tear in the blue speaker grill cloth. The Muse slide switches are stiff, but all are functional. They will need to be cleaned and lubed.

Label Information on the Muse back foil label. Hard to read, but I think it says...
MODEL MUSE-1
40 W
No. 010209-117
OK 50 Hz
and on the Speaker...
MODEL AS-1
40 w
No. 00214-120
OK 50 Hz"

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