Ampex MM-100

A professional sixteen-track two-inch tape machine whose paper trail is almost as interesting as the machine itself.

Period advertising in the trade press positioned the Ampex MM-1100 as an economical, compact, multichannel, high-performance audio recorder/reproducer. The ads called it a step forward by the leader (Studio-Sound, July 1973, p.61).

Overview

Documentation on the Ampex MM-100 is thin, fragmented, and in at least one case badly misattributed. The machine shows up in the historical record as a working studio tool rather than a catalog hero. The surviving evidence comes mostly from classified ads, studio equipment lists, and directory entries, not from any spec sheet or owner's manual. That absence is not proof the machine was obscure in its day. The paper just got lost.

The most concrete thing on record is a used-equipment clearance listing in a period trade publication. An "Ampex MM-100, 16-Track" is priced at $10,750.00, in the same ad as an Ampex MM-1000-16 at $12,250.00 and an MM-1000-5 play-only machine at $4,100.00. So the MM-100 was the cheaper of the two sixteen-track Ampex machines listed, and not by a trivial margin. For a studio in the late 1970s weighing a two-inch sixteen-track purchase, it was the value option next to the MM-1000. The ad's terms are worth a look too: all sales final, cash or certified check only, and a ten percent deposit held an item for fourteen days, refundable if inspection proved unsatisfactory.

A studio inventory from the same era lists an "Ampex MM100 16-track" as primary equipment at Spectrum Studios. It sits between a pair of Otari MTR-90 II twenty-four-tracks and a Mitsubishi X-86a two-track digital machine. So the MM-100 was still doing daily work as a multitrack while digital two-tracks were starting to appear in professional rooms. It was running next to Otari's flagship and a digital machine that cost many times more.

One caution for anyone searching: the "MM-100" designation was reused. A directory entry from the early 1990s describes a "Duplitronics MM-100 mastering system", a cassette and DAT duplication mastering system with a high-speed load system and S-VHS archival storage, tied to Duplitronics' DHS-1 digital headend. That is a different product from a different manufacturer and has nothing to do with Ampex tape machines. Searches for "MM-100" today will surface both, and the duplication system's documentation is considerably better preserved than the tape machine's.

None of the following is documented in the sources available here: what the MM-100 sounded like, how its transport was built, what heads it used, how many tracks it could sync, what it originally sold for new, and when Ampex introduced or discontinued it. Its reputation today rests on professional rooms keeping them in service, and on a used one costing real money in the late 1970s. Service manuals for the MM-100 do not appear to have circulated as widely as those for the MM-1000, and parts availability is an open question. Anyone chasing one should buy on condition and on the completeness of the head stack.