McIntosh MM-4 Microphone Mixer 1950s - Silver

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Available here is a rare and exceptionally musical piece of vintage broadcast and studio history: a 1950s McIntosh audio mixer, model MM4, type B106. This vintage three-channel tube mixer is configured with three microphone channels alongside a dedicated phono channel, offering an incredible front-end tool for the discerning analog recordist.

Under the chassis, this unit is pure, uncompromised all-tube analog circuitry from the golden era of high-end audio engineering. These units typically came with mixed input transformer setups; this particular unit originally shipped with a single UTC A11 transformer on one channel, leaving the other two bare. To elevate its capabilities, a matching pair of vintage UTC A11 transformers has since been expertly added inside, making the most of that glorious all-tube signal path across the board. It has been tested, works reliably, operates remarkably quietly for its lineage, and features responsive, sweet-sounding onboard bass and treble EQ sections that add wonderful shape to any source.

Sonically, the all-tube design of this McIntosh mixer delivers a breathtaking, highly usable vintage tone that has served on numerous professional recordings. It functions exceptionally well as a tube microphone preamplifier, imparting a rich, three-dimensional warmth, gorgeous harmonic saturation, and authentic tube glue that modern solid-state preamps simply cannot replicate. While it has been a reliable part of our workflow, it is ready to find a new home in an analog studio where its all-tube magic will see regular use.

At Joe’s Vintage Guitars, your satisfaction is our top priority. We stand behind every instrument we sell, and we want you to feel completely confident in your purchase. That’s why we offer a 7-day return policy with no restocking fee. Take a full week to inspect, play, and fall in love with your new guitar. If for any reason it isn’t the right fit, simply return it in the same condition for a full refund—no hidden fees, no hassle. We know that buying a vintage instrument is a big decision, and we’re committed to making the process as comfortable and transparent as possible. Shop with peace of mind knowing that every guitar from Joe’s Vintage Guitars is backed by honest service and years of expertise.