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Commercial Phase Linear Model 400 Series Two Audio Standard Power Amplifier Discover this pre-owned Phase Linear Model 400 Series Two Audio Standard Power Amplifier at Len Wallis Audio. Experience 210-watt vintage force with timeless performance. Key Features 210 WPC Output: Drives high-fidelity speakers. Export Model: Configured for 220/240V, 50-60 Hz. Vintage Design: Eight heat sink fins for cooling. Rack-Mountable: Fits professional setups. Robust Build: Durable for long-term use. The Phase Linear Model 400 Series Two Audio Standard Power Amplifier is perfect for vintage audio lovers
At A$1,200, this is ambitious versus your local benchmark: it sits above the 75th percentile of A$1,039 and well over the median of A$683, so it’s priced at the top end of recent AUD comparables. I’d only call it good value if this example is unusually clean, serviced, and complete with the right supports or provenance.
The upside is that these are respected old-school power amps with a strong following for sheer drive, dynamics, and a big, lively presentation that suits demanding speakers. If it’s an original, tidy unit with no hum, channel imbalance, or prior repair history, it can still be worth considering for the right buyer — but at this level I’d want proof of health, because age-related servicing can quickly erase the premium.
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.
