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Buyer’s market, but not a screaming bargain at A$775 unless this one is recently serviced and genuinely clean. Typical asking prices I found for working examples cluster around A$890–A$1,130, with serviced pieces reaching roughly A$1,470, while rougher unserviced examples can land closer to A$750–A$900. That puts this listing around fair-to-slightly-keen, not cheap.
The 700B is still a serious classic: huge power, authoritative grip, and a big, effortless sound when healthy. That makes it a worthwhile buy for someone who wants vintage muscle and is prepared for age-related service history to matter more than cosmetics. At this price, the key upside is originality plus proof it’s been checked, recapped, or otherwise stabilized; without that, the value softens fast on an amp of this age.
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.
