Otari MX-50
A quarter-inch two-track that put professional tape handling within reach of the personal studio.
Overview
Otari built the MX-50 around a simple proposition: everything you want in a two-track tape machine, without blowing the budget. That's the company's own framing, not a reviewer's. According to the manufacturer's own literature, this deck was the entry-level rung on Otari's tape recorder ladder. A lot of Otari's top-of-the-line thinking filtered down into that bottom rung.
The core of the machine is a DC quartz PLL capstan motor, the same fundamental design family used across Otari's professional line. Speeds come in pairs - either 15/7.5 or 7.5/3.75 ips, selected from the front panel. The capstan can be varied by ±7% from the front panel for pitch control, or pushed as far as ±50% via SMPTE time-code external controllers through Otari's standardized 37-pin connector. That connector is the same parallel interface Otari used across its multitracks, so the MX-50 can talk to synchronizers, editors, and controllers built for the bigger machines.
The transport handles 10.5-inch reels with self-centering NAB hub locks. Independent reel-size selectors for supply and take-up let you run mixed reel sizes, which is handy when you're working through a stack of odd jobs. A built-in tape timer reads out in hours, minutes, and seconds. There's also a search-to-cue locator with cue-point and zero-location memories, so you can store a position, wander off, and come back to it. Dynamic braking works in all transport modes. The transport is microprocessor-based, and it was designed so future updates could be installed by swapping an easily accessed EPROM chip.
The electronics are serious for the price point. The inputs are transformerless active balanced types on XL-type connectors. The VU meters are lit, with peak-reading LED indicators. Equalization is switchable between NAB and IEC. Reference flux levels are also switchable, at 185, 250, 320, or 514 nWb/m, which is unusual for a budget two-track and makes the machine compatible with the popular tape reference flux standards. You normally find that on machines costing considerably more. Otari said the MX-50 was targeted at the discriminating professional who demands quality, durability, and reliability.
Then there's the oddity that makes the MX-50 a cult item: the optional Voice Editing Module, or VEM. Installed, it lets the machine run at twice normal play speed while holding the original pitch - or, more precisely, pitch-shifting the audio down one octave so dialog stays intelligible when the tape is flying past at double speed. The signal is available at the front-panel headphone jack, which has its own amplifier and level control. In dialog editing sessions you need to cover tape quickly while hunting for edit points, and the VEM does that. One period reviewer, writing in Mix (April 1989, p.88), was impressed enough with the audio performance to call the machine remarkably clean for a quarter-inch 7.5/15 ips deck in its price range.
Serviceability was built in from the start. Every PCB carries component part numbers and trimmer designations silk-screened on both sides, so a tech can identify what they're looking at without hunting through a schematic. The record and reproduce heads are separately optimized. The record head's gap width is set for the trailing-edge magnetization that actually does the recording. The reproduce head's gap is kept as narrow as practical to resolve the shortest wavelengths.
What the MX-50 asks in return is patience. It's a two-track quarter-inch machine, not a multitrack, and its feature set - the flux-level switching, the 37-pin interface, the VEM - rewards someone who actually uses them rather than someone who wants plug-and-play. Otari's own advertising billed it as the machine for "whenever or wherever you need a professional audio machine at an affordable price."
It is not a machine for someone who wants a museum piece to look at. It suits someone who wants to record to quarter-inch tape with real speed control, real alignment flexibility, and a transport that was built to be fixed rather than replaced.
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