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The market median for this model is US$439, with the middle half running from US$252 to US$881, so US$670 is a fair, comfortably mid-market asking price—not a bargain, but not inflated either. The unknown condition keeps it from being an especially strong buy at that figure.
The 620 remains a serious vintage power amplifier: a robust 100 watts per channel into 8 ohms, with unusually wide bandwidth, very low distortion, and excellent measured noise performance. Its 100V/240V, 50/60Hz compatibility is useful for international systems. At US$670, prioritize a clean, fully tested example with quiet operation, working peak indicators, and no evidence of neglected servicing; a recently checked unit or original accessories would make the price considerably more attractive.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Nakamichi was founded in 1948 by Etsuro Nakamichi as a research institute in Tokyo, Japan, initially providing R&D services for major corporations and government entities before transitioning to consumer audio manufacturing under its own name beginning in 1972. The brand emerged from deep technical expertise in electromagnetism, magnetic recording, and acoustics, establishing itself as a pioneering force in Japanese audio engineering. Today, Nakamichi operates as a subsidiary of Chinese holding company Nimble Holdings, maintaining its heritage while expanding into contemporary audio categories.
The brand built its legendary reputation on cassette deck innovation, introducing the world's first three-head recording deck and the iconic Dragon series (1982), which featured bi-directional replay and automatic azimuth correction—innovations that remain highly sought after by collectors, with pristine examples commanding thousands of dollars on the secondary market. Beyond vintage cassette decks, Nakamichi's modern product portfolio encompasses home cinema audio systems, sound bars, speakers, headphones, mini hi-fi systems, automotive stereo products, and automotive lighting solutions, reflecting a diversification strategy that extends its audio expertise across multiple consumer segments.
Nakamichi occupies a distinctive position bridging vintage collectibility and contemporary consumer audio. The brand commands respect among audiophiles and hi-fi enthusiasts for its uncompromising engineering standards and Japanese precision, while simultaneously serving the automotive and mainstream home audio markets. Its legacy as an innovator in analog audio technology, combined with its evolution into modern product categories, positions Nakamichi as a heritage brand with credibility across both specialist and general consumer segments.
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