Telefunken M-15A
A control-room workhorse that showed up in more studios than its paperwork ever did.
Overview
The Telefunken M-15A is spelled "M15A" in most period print, and "magnetophon 15A" on Telefunken's own literature. It survives in the record mostly through the places it worked, not through a tidy factory datasheet. The archive's material is fragmentary: a handful of magazine advertisements and editorial mentions, plus a cluster of contemporary classified listings that put the deck in real rooms doing real work. No production years are confirmed in the archive's sources, so the lifespan stays an open question here.
The period pages do establish that this was a multitrack master recorder offered in several track configurations. A 1977 announcement in Recording-Engineer (October 1977, p.82) identified the newly introduced units as the M-15A Magnetophon multi-track master recorder. It described an autolocator built around microprocessor control with nine position memories, plus a variable-speed capstan controller with LED readout. Telefunken's own advertising from the following year made the same pitch. A Studio Sound ad (August 1978, p.51) headlined "32 tracks available now" and presented the machine as a complete system - the autolocator with its nine-position memory and stop timer, remote track selectors, and a capstan speed controller with crystal-precise digital reference. An earlier ad in the same magazine (October 1976, p.51) framed the M15A around "solid engineering and trouble-free performance." Every manufacturer makes that claim, and only the service history can settle it.
The most concrete engineering detail in the archive comes from a review of the M15A in Studio Sound (November 1976, p.70). It noted that the inputs and outputs were floating and isolated from ground, with an additional link on the machine for separating signal ground from chassis ground. The reviewer called that a very sensible addition. The same review measured input impedance at a constant 16,900 ohms across the audio band, and reported that recording level was reached with an input in the range of roughly −12 to −10 dBm.
The archive's sources diverge on configurations. A period equipment roundup describes the Magnetophon 15A multi-track systems as compact units for 8 tracks on 1-inch tape and 16, 24, or 32 tracks on 2-inch tape, with the channel amplifiers built into the console below the tape deck. It also notes the design was derived from the well-proven M15, redesigned for easier and more versatile application. A separate manual-style listing in the archive gives a broader spread for the M15A: two-, four-, eight-, 16-, 24-, and 32-track operation at 7½, 15, and 30 ips, with quarter-, half-, one-, and 2-inch tape formats. The two accounts do not line up cleanly on tape widths and track counts, and the archive flags the discrepancy rather than resolving it. Confirm the exact configuration against a machine's own head assembly and manual before trusting any published list.
The M-15A also turns up in the classified columns. A Gotham Audio notice in the archive's listings offered used and demonstrator equipment including Telefunken M15A 24/32-track and ¼-inch master recorders. A 24/32-track multitrack and a quarter-inch master in the same disposal list suggest the platform was sold into both multitrack rooms and mastering suites. None of these are reviews. They are the paper trail of a machine that was bought, moved, and resold.
The M-15A is documented here through its working life rather than its spec sheet. The floating, ground-isolated I/O and the constant 16,900-ohm input impedance are the two engineering facts the archive can stand behind. The autolocator with nine-position memory is confirmed by both a period announcement and Telefunken's own advertising. Production years, original pricing and the precise track-and-tape matrix need a manual in hand. Anyone who owns an M-15A and has its documentation can fill that gap in this file.
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