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Audio Research D240 MKII Power Amplifier There are two available, the price is per unit. These can be run in mono configuration. I will consider separating. The Amplifier Story “The D240 stereo power amplifier represents a new milestone in amplifier design: it combines the musicality and life-like imaging of vacuum-tube and hybrid amplifiers with the maintenance-free convenience of all-solid-state circuit technology. The D240's one-button operation couldn't be simpler - one push and you're ready to play. There's no question about it- the D240 will change the way you think about solid-state
A$995 looks fair-to-good for this Audio Research power amp: it’s a touch under the rough used-market midpoint, so it’s not a steal, but it is solid value if the unit is healthy. For a well-kept example, that’s the kind of asking price that makes sense rather than one that needs a hard haggle.
The D240 MKII is respected for its big, effortless ARC sound: open mids, good control, and the kind of tube-driven musicality that still works well with demanding speakers. The upside here is mostly in condition and service history—on an amp of this age, confirmation of recent tube health, biasing, and any recap or service work matters more than cosmetics.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Audio Research Corporation, founded in 1970 in Minneapolis, Minnesota, by William Z. Johnson, traces its roots to his pioneering work in custom audio electronics during the 1950s and his operation of a specialty retail store through the mid-1960s. After a brief stint selling his designs to a larger firm, Johnson regained independence to establish ARC with a singular mission: advancing the state-of-the-art in music reproduction. From modest beginnings in the back of his shop, the company evolved into one of America's oldest continuously operating high-end audio manufacturers, now housed in a state-of-the-art 48,000-square-foot facility in Maple Grove, Minnesota.
ARC specializes in performance-driven electronics, renowned for vacuum-tube amplifiers, preamplifiers, and electronic crossovers that emphasize sonic purity over flashy features or aesthetics. Drawing on circuit designs rooted in the 1950s, the brand integrates tubes into modern contexts, delivering what it calls "high definition" sound through genuine technological advances. While not venturing into speakers, turntables, DACs, headphones, or cables, ARC's focused lineup prioritizes amplifiers and preamps that set benchmarks for musical realism.
Positioned at the pinnacle of high-end audio, Audio Research is hailed as a true originator of the genre, commanding respect among audiophiles for its unwavering commitment to excellence and innovation. Enduring the 1970s tube revival against solid-state dominance, ARC thrives via elite specialist retailers worldwide, standing alongside peers like Conrad-Johnson as a vintage-inspired yet forward-thinking force in the niche boutique market.
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