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Are you buying the amplifier, or also paying for its provenance? At £1,950, this is a strong but not outrageous ask: UK dealer evidence places KSA-50 examples around £1,199, while restored examples abroad list higher, so this price sits above ordinary used-market territory but can be fair for an excellent, serviced specimen. Without condition details, it is not an obvious bargain.
The KSA-50S remains a serious performer: 50 watts per channel into 8 ohms, with substantial current delivery, excellent bass control, dynamics and a more refined, neutral balance than the original KSA-50. It runs hot and weighs roughly 52 lb, so allow proper ventilation and safe transport. At this money, insist on a full functional demonstration, both channels matching, the supplied XLR shorting plugs if using RCA, and evidence of recent service; otherwise, negotiate firmly toward the lower end of the market.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Krell Industries, founded in 1980 in the United States by Dan D'Agostino and his wife Rondi, emerged from a passion for pushing audio engineering boundaries. Based initially in Bridgeport, Connecticut, and later settling in nearby Orange, the brand drew its name from the advanced alien race in the 1956 film Forbidden Planet, symbolizing limitless technological power. The company's debut at the 1981 Consumer Electronics Show with the KSA-100, a high-power Class A amplifier, sparked immediate demand and established Krell as a force in American hi-fi innovation.
Krell specializes in high-end amplification, with its power amplifiers—epitomized by flagships like the Master Reference Amplifier—earning legendary status for their raw dynamics and precision. The lineup extends to preamplifiers, surround sound processors, digital-to-analog converters, CD and Super Audio CD players, loudspeakers, and subwoofers, all engineered for uncompromised performance in music and home theater systems.
Positioned firmly at the pinnacle of the high-end audio market, Krell commands respect among discerning audiophiles for its cutting-edge circuitry, massive power supplies, and relentless pursuit of sonic excellence. A top-tier brand alongside legends like Levinson and Threshold, it appeals to buyers seeking reference-level gear that defines the genre, even amid recent ownership transitions following Rondi's passing in 2024.
See all Krell listings on RADAR.
