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Up for sale is an exceptionally rare prototype / military factory-built Harman Kardon Citation I stereo tube preamp. This is not your everyday Citation I — it appears to be a unique early or special-production unit with characteristics that set it apart from standard retail models, making it a fascinating piece for collectors, vintage audio enthusiasts, and tube gear historians.The Citation I is already regarded as one of Harman Kardon’s legendary tube preamps, known for its warm, detailed sound and highly respected design. This example stands out due to its prototype / military factory origins and uncommon construction details that may differ from standard production versions.Condition: Vintage unit with cosmetic wear consistent with age Please review all photos carefully as they are part of the description Tested and works perfect! Sold as-is due to the age and collectible nature of vintage tube equipment This is an opportunity to own a rare and unusual piece of Harman Kardon history that rarely surfaces on the market.Feel free to reach out with any questions or requests for additional photos.
Unknown condition makes this ambitious at US$2,999 unless it has been freshly serviced, documented, and is unusually complete. A clean used Citation I is more commonly seen around US$1,995, so this asking price is well above the usual going level and only makes sense if the piece is exceptional in originality, cosmetics, or restoration work.
As a buy, it still has real appeal: the Citation I is a landmark late-1950s tube preamp from Stewart Hegeman, with a respected all-tube design, wide bandwidth, and enough cachet to justify premium interest from serious vintage buyers. If it’s truly clean, unmodified in the important places, and comes with the optional walnut cabinet or full service history, that can add meaningful value; otherwise, at this price, I’d want proof that the power supply, controls, and tube complement are in strong shape before jumping.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Harman Kardon traces its origins to 1953, when Dr. Sidney Harman and Bernard Kardon, both engineers frustrated with conservative audio manufacturing at the David Bogen Company, invested $5,000 each to launch their venture in Westbury, New York. Their debut product, the Festival D1000, became the world's first compact AM/FM hi-fi receiver, blending breakthrough technology with sleek design to make high-fidelity sound accessible beyond technical enthusiasts. Pioneering innovations like the 1958 Festival TA230 stereo receiver, the 1959 Citation II ultra-wide bandwidth tube amplifier, and the 1970 CAD5 hi-fi cassette recorder with Dolby noise reduction cemented their legacy in simplifying premium audio for the home.
The brand focuses on integrated receivers, amplifiers, tuners, and speakers that emphasize performance, reliability, and elegant industrial design. Over decades, it expanded into home theater systems and automotive audio, powering systems in vehicles from Land Rover and BMW to Volvo and Polestar. While not delving into turntables, DACs, headphones, or cables, Harman Kardon prioritizes cohesive hi-fi components that deliver warm, detailed sound without unnecessary complexity.
Harman Kardon holds a solid mid-tier position in the hi-fi market, renowned among knowledgeable buyers for its enduring quality and value rather than ultra-high-end exotica or vintage collector status. Now part of Harman International, it appeals to discerning listeners seeking dependable, stylish gear that echoes its innovative heritage without commanding boutique premiums.
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