MCI JH-120
A quarter-inch two-track built from a clean sheet, not carved out of a bigger machine. The manual's numbers say it was meant for work.
Overview
The JH-120 is the quarter-inch two-track member of MCI's JH-100 family. It shares its chassis and transport with the half-inch four-track JH-140. It wasn't a scaled-down version of something larger in the line. The design was drawn from scratch. MCI's own period advertising said the JH-120 and JH-140 were conceived over roughly two and a half years as new designs, not remodeled versions of a bigger recorder or a patchwork of new technology fused onto outdated circuits. That's marketing copy, not an independent verdict, but it shows what MCI thought it was selling: a purpose-built professional two-track, not a consumer deck dressed up in rack ears.
The transport is the strong point. Tape tension is servo-controlled at 3½ oz on both supply and take-up, held constant across all speeds and reel sizes. That spec doesn't sound like much until you've fought a machine that lets tension drift as the reel packs down. Reels from 3" up to 11%" in EIA or NAB hub, plastic or metal, are accommodated. The capstan is a phase-locked DC design, crystal controlled, with speed selection fixed by the machine's configuration: either 5 to 45 I.P.S. or 2 to 22 I.P.S., depending on how it was ordered. Start time is quoted at 5 seconds or less at 15 I.P.S., and a full 2400 feet winds in under 90 seconds. There's a paper-basket tape-dump mode on the EDIT button, and a hand-spool mode with reduced brake force that engages automatically in STOP. Both are small conveniences on a session floor.
Frequency response is specified against a 1 kHz zero reference recorded on Scotch type 206 or equivalent high-output low-noise tape, so the manual is at least honest about the tape it was measured on. The quarter-inch machine is available as a two-track, or with a quarter-track option, and a fourth-head option was offered as well. That flexibility is unusual for a professional two-track.
Physically it's a floor-standing machine: 35" high, 26" deep, 25¼" wide, with a system weight of 190 pounds. Power is 100-220V selectable at 50-60 Hz, drawing 4 amps at 120V operation. None of that is glamorous, but you want to know it before you agree to move one.
Recording Engineer (August 1975, p.9) ran MCI's launch material for the JH-120/JH-140 pair, framing the two machines as a matched new-generation design — the quarter-inch JH-120 and half-inch JH-140 — rather than derivatives of the existing line. The same issue's dealer listings show the JH-120 already moving through US distribution, with World Electronics in North Miami Beach advertising a JH-120 two-track in stock (p.56). By the time studios were specifying rooms around it, the JH-120 shows up in facility listings as the stereo machine alongside larger MCI multitracks — Marquee Studios in London, for instance, listed an MCI JH-120 for stereo work next to a JH-140 four-track and a JH-100 24/16 desk, and Le Chateau in France ran a JH-120 as its four-track and two-track machine (period studio directories, 1975). That's the company the JH-120 kept: it was the two-track in rooms that already trusted MCI for the multitrack.
Studio Sound (March 1975, p.31) carried a specification listing for the machine that priced it at £1790, with NAB or IEC equalisation selected by plug-in units, an interchangeable block head assembly, sel-sync, and optional varispeed and remote control. The same listing gives a two-track unweighted noise figure of 62 dB, with record/playback noise 4 dB above bulk erase noise, and a digital tape-position indicator accurate to 0.1%. Those are the numbers a buyer in 1975 would have weighed against the competition, and they position the JH-120 firmly in the professional two-track market rather than the prosumer one.
Owners and collectors tend to talk less about any single spec than about the transport's manners. The servo tensioning and the phase-locked capstan make the machine feel like a professional tool rather than a hot-rodded home deck. The trade-off is that a 190-pound floor-standing transport with a DC servo capstan is not a machine you service casually. It wants someone who understands the servo loop and the speed-selection configuration, and a machine set up for one speed range isn't a knob-twist away from the other. Buyers should confirm which speed range a given example was configured for, since the manual treats 5-45 I.P.S. and 2-22 I.P.S. as factory selections rather than a switch.
The quarter-track option and the fourth-head option are worth checking on any individual machine, because they change what the deck can do. A JH-120 set up as a quarter-track with a fourth head is a different tool from a plain two-track, and the manual lists both as available configurations rather than standard fit. Head wear and the condition of the interchangeable block assembly are the usual points to inspect, along with the servo tension and capstan lock, which most affect whether the machine will hold speed and pack tape cleanly.
The JH-120 is the natural stereo companion to the larger JH-series multitracks, and its appearance in 1975 studio directories alongside JH-100 and JH-140 machines confirms that's how it was actually deployed. It isn't the most famous MCI, and it isn't the biggest.
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