Nakamichi 630 (c. 1976)
The documentation on the Nakamichi 630 is muddled. Most sources, including Wikipedia, hifiengine, and hifi-wiki, agree it was a separate preamplifier, part of Nakamichi's push into premium separates that began with the 1000 series. Wikipedia states the 630 shared its topology with the Model 620, which Nakamichi introduced alongside the 610 in 1976 as its own line of separate preamplifiers. The 630 was reportedly designed in cooperation with Nippon Gakki Co. Ltd - the parent company of Yamaha - though the details of that collaboration are not documented.
It gets messier. At least one dealer listing describes a "Nakamichi 630 Solid State Stereo Integrated Amplifier," made in Japan from 1973-1976, and places it in a lineup between the 620 and 730. It is unclear whether this is a misidentified version of the same unit or a different product sharing the model number. The sources do not resolve it. Reliable technical specifications (frequency response, output, THD) are not documented for either interpretation. Period advertising is clearer. Nakamichi marketed the 630 as part of the 600 Series trio alongside the 600 Cassette Console and 620 Power Amplifier. The 630 was the tuner/preamplifier, with a phono section, tone and contour controls, tape monitor and copy facilities, and a high-output headphone amplifier. Audio (September 1977, p.79) published the manufacturer's specs for the tuner section, including a capture ratio of 1.0 dB in wide mode and frequency response of 50 Hz to 15 kHz, +0, −1.5 dB.
Surviving information on the 630 is thin. No owner reviews, original pricing, or production figures are recorded. If you own one, the archive would welcome hearing from you.
- Separate preamplifier (per Wikipedia, hifiengine, hifi-wiki), or possibly an integrated amplifier (per classic-audio.com)
- Shares topology with Nakamichi 620; part of the 600 Series with the 600 cassette console and 620 amplifier
- Designed in cooperation with Nippon Gakki (Yamaha's parent)
- FM tuner section: capture ratio 1.0 dB (wide), frequency response 50 Hz–15 kHz, +0/−1.5 dB
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