JVC KD-85 Stereo Cassette Deck
A Sendust-head deck that JVC quietly engineered to record metal tape before the tape even existed.
Overview
The KD-85 is the cassette deck JVC built to sit in the middle of its 1978 MusicTower stacks — specifically the LX-2000 system, where it shared a rack with the JT-V77 tuner, the JA-577 integrated amp, the QL-A7 quartz turntable, and the SEA-50 graphic equalizer. That placement tells you most of what you need to know about the deck's ambitions: it was meant to be the recording heart of a serious component system, not a budget afterthought. Audio (November 1978, p.100) ran a full equipment profile on it, listing a frequency response of 30 Hz to 16 kHz, harmonic distortion of 1.2 percent, and a signal-to-noise ratio of 56 dB that climbed to 62 dB with ANRS engaged.
That ANRS figure is the one to watch. JVC's own noise-reduction system predated the widespread adoption of Dolby, and on the KD-85 it bought a meaningful 6 dB of headroom over the unassisted figure. The Audio profile also recorded the deck's dimensions as 17¼ inches wide, 6¼ inches high, and 12⅛ inches deep, at a weight of 21.8 lbs (9.9 kg). That's a substantial chunk of metal and transport for a cassette deck, and it speaks to the build JVC was aiming for.
The head design is where the KD-85 gets genuinely interesting. JVC fitted its proprietary Sendust heads — branded Sen-Alloy — and High Fidelity (September 1978, p.13) made a point of the choice in the deck's launch advertising, noting that where most makers went with either permalloy or ferrite, JVC combined the best of both. The practical payoff showed up a month or two later, when the audio press corps was invited to JVC's New York offices and shown a special version of the KD-85 that could record metal-particle tape. Audio (October 1978) reported that JVC demonstrated the deck recording five different metal-particle tapes — declining to name the brands — specifically to prove that Sendust heads could handle the high coercivity and remanence that metal tape demanded. A production metal-capable deck was said to be waiting in the wings pending the release of 3M's Metafine. Whether that version ever shipped under the KD-85 badge is a question the surviving documentation doesn't answer, but the demonstration itself says something about how seriously JVC took the head design.
Modern Recording (September 1978, p.73) singled out two features that set the KD-85 apart from other stereo cassette recorders in its price category, and the more important of the two was the spectro-peak LED indicator. The reviewer's argument was practical: to use the full dynamic range of any deck, you have to fit the program material precisely between the noise floor and the onset of saturation, and a spectro-peak display lets you see where the peaks are landing rather than guessing from a needle. The same review (p.72) found that on all other counts the deck performed as claimed — signal-to-noise was called excellent, distortion low, and recording headroom ample.
Input sensitivity was quoted at 0.2 mV for the microphone inputs and 80 mV for line, with output level at 500 mV line and 0.5 mW at 8 ohms for headphones. Those are workmanlike numbers, but they're the kind that make a deck easy to integrate into a system rather than fussy about matching. The KD-85 also turns up in the working gear lists of the period: a Mix magazine studio feature from May 1979 lists a JVC KD-85 cassette among the rack-mounted control-room equipment at 1233 Studios, alongside Tascam 80-8s, dbx 160 compressors, and a Revox A-77. A cassette deck holding its own in a studio rack next to open-reel machines is not nothing.
What the KD-85 is not, at least on the evidence available, is a deck that has attracted a collector following the way Nakamichi's or Tandberg's machines have. Documentation is thin, surviving units turn up infrequently, and the metal-tape story — compelling as it is — remains a demonstration rather than a confirmed production feature. For the enthusiast who finds one, the appeal is the Sendust head, the spectro-peak metering, and the sense of a deck built to a standard rather than a price. It rewards the same things any good cassette deck of the era rewards: clean heads, a fresh belt, and a willingness to calibrate bias for the tape you're actually using.
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