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Graaf 5050 Valve Power Amp Boxed 50w Very good boxed with remote. Upgraded with Jensen caps a few years ago.
At £1,450, this Jensen Graaf 5050 asks nearly six times the median used price of £122 for comparable valve power amps, making it an aggressively overpriced outlier compared to the obvious alternative of buying a standard 50W tube amp for under £300. The listing sits far above the 75th percentile of £267, and without confirmed model specifics distinguishing it as a rare integrated unit rather than a standard power amp, the price lacks market support.
The Graaf GM50 series is well-regarded for its 50W all-tube output, 0.15% THD, and robust 30kg build, delivering clean power with minimal distortion. However, unless this specific boxed unit includes original documentation, rare tubes, or is a verified GM50B integrated model (which retailed near £3,950 new), the £1,450 asking price demands significant caution. For a fellow enthusiast, this reads as a risky gamble unless the seller can prove it’s the high-end integrated version in pristine, original-owner condition with full accessories.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Jensen traces its origins to 1915, when Danish-born inventor Peter L. Jensen, alongside Edwin Pridham, pioneered the world's first practical loudspeaker, dubbing it the Magnavox. In 1927, Jensen founded the Jensen Radio Manufacturing Company in Chicago, initially producing speakers for radios, military applications, and public address systems. The brand quickly dominated, supplying OEM components to 60% of U.S. independent radio makers within two years, and evolved through entities like Jensen Industries into a cornerstone of post-war audio innovation.
Historically renowned for loudspeakers—ranging from coaxial designs in the 1940s to triaxial models and raw drivers—the brand powered iconic guitar amplifiers from Fender and Gibson during the 1950s and 1960s. Production of original hi-fi speakers ceased in the late 1960s, but the name endures through licensed reissues by SICA in Italy since the 1990s, including modern Jet Series for guitars, alongside contemporary mobile audio like car receivers, amplifiers, and multimedia systems under Namsung America.
Today, Jensen occupies a mid-tier consumer position, blending vintage heritage with accessible mobile and automotive electronics rather than high-end hi-fi. Its reputation rests on pioneering tone and reliability, appealing to nostalgic collectors, guitar enthusiasts, and everyday drivers seeking value-driven performance over boutique exclusivity.
See all Jensen listings on RADAR.
