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Compared with what a lot of buyers would be spending on a fresh modern power amp at this price, US$600 for a Phase Linear 400 is ambitious versus the current used pool, which centers much lower at a US$420 median and tops out at a US$517 75th percentile. That puts this listing above the usual market band rather than in bargain territory.
The Phase Linear 400 still has real appeal: it’s a classic high-power vintage amp with a reputation for big, effortless drive and the kind of muscular presentation many collectors still chase. At US$600, though, the value hinges on condition, service history, and whether it’s been properly refreshed; these amps are old enough that a clean cosmetic case alone isn’t enough. If it’s truly well cared for and recently serviced, it can still be a worthwhile buy, but this is a premium ask, not an easy snap-up.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Phase Linear was founded by Bob Carver in his home in Edmonds, Washington, around mid-1969, with the company officially launched in 1970 from a small building at 405 Highway Way. Operating as an American manufacturer during the golden age of high-fidelity audio, Phase Linear quickly established itself as an innovator in power amplification. The company remained independent until 1979, when Pioneer Electronics Corporation acquired it, though Phase Linear continued operating under its own brand until manufacturing ceased in 1983.
The brand built its reputation primarily on high-powered amplifiers, most notably the Phase Linear 700, unveiled in 1970 and delivering an impressive 350 watts per channel—a significant achievement for the era. This inaugural design became the company's flagship offering and exemplified their engineering philosophy of combining substantial output with reliable construction. Phase Linear's amplifiers became synonymous with driving demanding speaker loads and delivering the dynamic power that serious audiophiles sought during the 1970s and early 1980s.
Phase Linear occupies a distinctive position in audio history as a vintage collectible brand rather than a contemporary manufacturer. Among enthusiasts and restoration communities, the company is remembered fondly for solid build quality and components that continue functioning reliably decades after production ended. Today, Phase Linear equipment appeals primarily to vintage audio collectors and restoration hobbyists who value the brand's engineering heritage and the warm, characterful sound signature associated with classic 1970s amplification.
See all Phase Linear listings on RADAR.
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