Vintage Roland System 100M 131 – Output Mixer, Tuner & Headphone Amp = MINT Condition

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Roland System 100M 131 – Output Mixer, Tuner & Headphone Amp

An essential component of the iconic System 100M, the M‑131 serves as your main audio output hub—combining mixer channels, tuning oscillator, headphone amplification, and more. It’s designed for both patch flexibility and hands-on control.

• 4-input stereo mixer with level and pan knobs for each channel, plus a master volume for main and mono outputs .

• Built-in tuning reference oscillator offering 22 Hz, 440 Hz, and 880 Hz tones—ideal for tuning VCOs .

• Headphone amplifier with separate level control; useful for practice, patching, and stage monitoring .

• Durable metal chassis and knobs, true vintage Roland UX feelen.wikipedia.org+15reverb.com+15gearspace.com+15.

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• Indispensable in any 100M setup—you need it to consolidate signals and monitor output.

• Tuning oscillator handy for manual calibration during patching or live use.

• Headphone amp adds convenience—great for silent studio work.

• Straightforward UI—no menus or settings, just intuitive knobs.

• No audio generation—only mixes output; requires other modules to produce sound.

• Vintage wear and tear is common—pots and jacks may need servicing.

• Limited by mono architecture, though stereo panning is possible.

• Power specs/aging caps—should be checked before operation.

Vintage Synth Explorer notes the M‑131’s centrality in patch flow and its classic Roland “fruity” filter contexten.wikipedia.org+15vintagesynth.com+15reverb.com+15en.wikipedia.orgreverb.com. Users on Reverb and forums highlight its utility and nostalgia factor reddit.com+7reverb.com+7reverb.com+7.

The M‑131 is a cornerstone module for any serious Roland System 100M operator. Beyond being the final mixer stage, its tuning oscillator and headphone interface significantly contribute to performance and workflow.

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