Nakamichi 682ZX (1980–1982)

Name: Nakamichi 682ZX
Brand: Nakamichi

A single-speed, discrete-head deck that Nakamichi built for the tape obsessed - and that aficionados still rate above the Dragon.

Overview

Nakamichi built the 682ZX as the second generation of the 680ZX. It is a single-speed machine, standard speed only. No auto-reverse, no half-speed, just a transport and head set engineered for accuracy. The original price shows who it was for: ¥228,000 in Japan around 1981, or a manufacturer's suggested retail of USD $1,800. Sources disagree on the timing. Some say Nakamichi first sold it in 1981, others note it retailed for $1,800 in 1980, and the commonly cited production window runs 1980-82. Either way, it was a serious investment at a time when most buyers still treated cassettes as convenience media.

It sat between the mid-tier 582 and Nakamichi's flagship models, offering flagship-level engineering without the halo price tag. In the company's own words, courtesy of the owner's manual, the deck incorporates a "discrete" head configuration, a "diffused-resonance" double-capstan transport, and a DC recording amplifier section — plus automatic level calibration and automatic azimuth alignment. That list is the whole story of the machine. Nakamichi didn't want to be everything to everyone; the 682ZX was built for a niche, and it knew it.

Aficionados consider it a "sleeper" deck and rate it higher than the much more famous Nakamichi Dragon and the most technologically advanced Nakamichi CR-7A. That fits the design. The 682ZX was a bridge between the raw precision of the 580-series and the fully automated, computer-controlled decks that followed.

Discrete Three-Head System: R-8L, P-8L, and E-8L

The 682ZX uses a discrete three-head system. The recording head, reproducing head, and erasing head are completely separated from each other. The record head is an R-8L with a 3.5-micron gap and a laminated core made of crystalline material. The playback head is a P-8L, also with a laminated crystalline core, but with a much narrower 0.6-micron gap that prevents loss during playback. Nakamichi shaped both heads to eliminate core deflection, and rates them at more than 10,000 hours of durability. The E-8L erase head is a double-gap design. It combines a ferrite core for high-frequency efficiency with a Sendust core at the tip for high magnetic flux density, which gives thorough erasure even on dense metal tape.

Because the heads are separate, the deck can monitor a recording off the playback head in real time, without generational loss. The manual also notes that the discrete configuration lets the deck use separate Dolby NR processors for recording and playback. That level of circuit separation is usually reserved for professional gear. The playback head's frequency response extends to 22 kHz, and the deck is rated at 20 Hz to 22 kHz ±3 dB on ZX tape, or 20 Hz to 20 kHz ±3 dB on SX and EXII tapes.

Frequency-Distributed Double Capstan Transport with PLL Servo

Nakamichi calls the transport a "frequency-distributed" double-capstan system, and the name is literal. The two capstan diameters and the flywheel diameters are deliberately mismatched to avoid overlapping flutter cycles. Instead of one flutter frequency reinforcing itself, the two capstans produce different flutter signatures that cancel rather than compound. Per the manual, this gives stable tape travel and uniform head touch. Wow and flutter is rated at not more than 0.04% weighted rms, or not more than 0.08% weighted peak.

The main motor is a PLL servo type. It detects rotational speed fluctuations, compares the phase against a reference oscillator signal, and corrects the speed in real time. The deck runs at 4.8 cm/s. Some sources cite 4.75 cm/s, which is the same standard speed with different rounding. The mechanism is logic-controlled. Pressing a control button activates a logic circuit that drives a cam with a motor rather than a solenoid plunger, which quiets the mechanical clatter. A tape pad lifter prevents uneven pad pressure and vibration from the pad spring material. The chassis is aluminum alloy, chosen for its damping properties over iron, with resin out-plated on the aluminum to absorb small vibrations and prevent resonance.

Auto-Calibration and Bias Adjustment

Auto-calibration is one of the 682ZX's signature features, and it really is automatic. Press Auto Cal and Play from the recording pause, and the deck records a 400 Hz test tone, plays it back, and detects the phase difference between left and right channels to set azimuth. It then adjusts record and playback level in the same pass. The whole sequence takes approximately six seconds, with an error within ±0.5 dB. The adjustment range is ±2.5 dB from the reference value, which Nakamichi considered enough to cover normal music tapes. Manual override is there for anyone who wants to do it the old way.

Bias adjustment is a separate, hands-on procedure. The user records and plays back a 15 Hz test tone at −20 dB while watching the level meter, which is expanded by 20 dB for easier reading. The adjustment range varies by tape type: ±4.5 dB for the EX (normal) position, ±3 dB for SX (CrO₂), and ±6 dB for the ZX (metal) position. That last figure is the important one — metal tape was where the 682ZX could really stretch its legs, and the wide bias range let owners dial in specific formulations rather than settling for a generic "metal" setting.

Dolby B and C with Separate Record/Playback Processors

Both Dolby B and Dolby C are on board, switchable between C, B, and off. Dolby C works on the same basic principle as B but stacks two noise-reduction processors, one at the high-level stage and one at the low-level stage, to achieve a total of 20 dB of noise reduction. It also uses a sliding-band method, where the frequency at which noise reduction begins varies with input level and frequency content. This suppresses the pumping effect known as noise breathing. The manual puts it bluntly: Dolby C makes possible a 20 dB improvement in high-frequency S/N ratio over the unencoded signal. The deck's measured S/N is 72 dB or more with Dolby C engaged on ZX tape, or 66 dB or more with Dolby B.

FL Peak Level Meter, RAMM, and the Rest of the Front Panel

The display is a wide-range fluorescent peak level meter spanning −40 dB to +10 dB across 24 segments. It is fast enough to catch transients and granular enough to be useful during calibration. The RAMM (Random Access Memory Music) function lets you select and cue specific songs from a tape, a primitive but helpful indexing system for long compilations. There's also an easy-queuing feature. Press pause during fast-forward or rewind and tape speed drops to about one-third, so you can listen for the gap between tracks. Hold the FF/Rew button continuously and speed drops to about one-fifth for finer positioning.

The rest of the feature set: a built-in Rec Mute function, a built-in MPX filter for clean FM dubbing, timer recording and playback via an external audio timer, and a dedicated DC output for Nakamichi's BlackBox series rated at ±10 V, 125 mA maximum. A wired remote control was sold separately. The line output is 1 V at 400 Hz, 0 dB, into 2.2 kΩ. The headphone jack delivers 45 mW into an 8-ohm load. Input sensitivity is 50 mV into 50 kΩ. Bias frequency is 105 kHz. Power consumption is 36 W maximum, and the deck is designed for 100 VAC at 50/60 Hz. Dimensions are 482 × 143 × 340 mm (W×H×D). The circuit design uses a double NF (negative feedback) topology in the recording EQ, playback EQ, and output-line amplifier stages. The recording equalizer is directly coupled to the record head, and the playback head directly to the playback equalizer, with coupling capacitors removed to improve characteristics.

Historical Context

The 682ZX was developed as the second generation of the 680ZX, as a single-speed machine of standard speed only. Nakamichi deliberately declined to add half-speed or auto-reverse features, keeping the transport focused on one job. It sat between the mid-tier 582 and the flagship models, and it is best understood as a bridge between the raw precision of the 580-series and the fully automated, computer-controlled decks that followed. In collector circles it's been overshadowed by the later Dragon.

Collectibility & Value

Working-condition 682ZX units typically sell for $300 - $500, but fully refurbished examples with recapped power supplies, realigned heads, and new pinch rollers can command over $2,700. Recent eBay completed sales have ranged from $757 to $2,278, with a median around $1,422 based on three sales over the past twelve months. That is a small sample, so treat the median as directional. As Audio (June 1983, p.107) noted in its classified pages, even a one-year-old 682ZX was commanding $1,100 on the used market. Current listings include a recently serviced unit at $3,000 and a tested-working example at $2,657, while remotes for the Lx-5/682Zx/1000ZXL family show up in the $100 - $103 range. A Willy Hermann-restored example was listed on US Audio Mart at $3,950, and an avito.ru listing in Russia sat at 190,000 ₽.

Common issues are well documented by owners. Dried grease in the transport, worn shaft guides — particularly in the playback head assembly — and degraded electrolytic capacitors in the power supply are the usual suspects. A full service every 500–1,000 hours is considered essential, including demagnetization and head cleaning. Belt kits and idler tires are readily available, and capacitor restoration is a common upgrade path. The 682ZX's value lies in engineering integrity, not rarity — this is a deck that rewards maintenance. Owners note that once calibrated, it holds alignment for hundreds of hours, and the enthusiast consensus is that it's worth restoring if you're prepared to cover the time and effort involved.

Market Value

┌──────────────────────────────────────────────────────────────────────────┐
│ NAKAMICHI 682ZX                                                 Nov 2026 │
├──────────────────────────────────────────────────────────────────────────┤
│ High      $2,278                                  Latest          $1,422 │
│ Median    $1,422                                  Trend                — │
│ Low       $757                                    Volume           ~1/mo │
├──────────────────────────────────────────────────────────────────────────┤
│ $3,000 ┤                                                                 │
│        │                                                                 │
│        │                                                                 │
│ $2,014 ┤                                       .                         │
│        │                                                                 │
│        │                                                                .│
│        │                                                                 │
│   $700 ┤.                                                                │
│        ├─────────────────────────────────────────────────────────────────│
│    vol │█                                      █                        █│
│        └─────────────────────────────────────────────────────────────────│
│         2026-02                      2026-04                      2026-06│
└──────────────────────────────────────────────────────────────────────────┘

eBay completed sales. Excludes accessories, parts, and non-working units. Hover points for details.