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Vintage Phase Linear 4000, w/ Wood Cabinet – Parts/RepairNON-WORKING / FOR PARTS OR REPAIR. I attempted to power the unit on and it does not power up. I do not know the cause and have not diagnosed or repaired it. No further functional testing has been performed.The unit shows age, dust, oxidation, scratches, marks and general cosmetic wear. The wood cabinet also has scratches, staining and age-related wear. Please examine all photos carefully for condition.The top cover has been removed and the interior photographed so buyers can see the internal condition.Model: Phase Linear 4000Serial No.: 9676Sold strictly AS-IS, non-working, for restoration, parts or repair. No guarantee of functionality.
At US$200, this sits well below the recent used median of US$400 and even under the 25th percentile at US$300, so it reads as a strong bargain rather than just a fair buy. For a Phase Linear 4000, that’s especially appealing if you want a classic preamp with real collector/enthusiast appeal without paying premium money.
The attraction here is the big, confident, late-’70s sound and the sheer usefulness of a well-kept vintage preamp in a serious two-channel system. If the unit is clean, functional, and not missing anything essential, the price leaves room for routine servicing and still makes sense. With vintage Phase Linear gear, the main buy is condition and service history, but at US$200 the upside is solid if this one has been cared for.
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.
