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This preamplifier includes its box, packaging and manual, it comes from a high-end collector who has not used it in years. I believe he was a pipe smoker because there is a faint smell of pipe tobacco in the box. Overall condition of the unit is pretty nice while it is untested buy me at powers on when plugged in. I also have the matching cassette deck up for sale, which is in my other listings model HK705.
This one reads as a bargain at US$190. With only 3 recent comps in hand, the median sits at US$385 and the 25th percentile is US$287, so this asking price is clearly below the low end of the typical used market and well under the median.
The HK 725 is a well-regarded line-stage preamp: a clean, straightforward piece that can add gain, source switching, and phono flexibility to a vintage or mixed system without fuss. At this price, the upside is real if it powers up quietly, all inputs work, and the controls are clean; for an older preamp, a quick check of noise, balance, and selector/switch behavior is the main buyer homework, but the price leaves room for minor service if needed.
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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