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Are you buying the amplifier, or its condition and service history? At £1,950, this looks fair rather than a bargain: comparable international examples sit around the same broad level after conversion, but a firm UK market percentile is unavailable. It is not obviously overpriced, though the price needs to reflect a clean, fully working specimen.
The KSA-50S remains a seriously capable power amplifier: genuine Class A operation, superb bass control, effortless dynamics, and unusually strong current delivery for its modest 50-watt rating. It can drive difficult speakers with authority and sounds more refined than the earlier KSA-50. At this age, insist on a proper audition, quiet operation, correct bias switching, and confirmation that the original power cord and any XLR-to-RCA grounding links are present. If recently serviced and cosmetically strong, £1,950 is defensible; otherwise, negotiate.
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.
