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At US$1,500, this is a bit above the US$1,300 median but still inside the US$1,250–US$1,525 comp band, so it reads as fair-to-slightly-strong, not a bargain. It is not expensive enough to raise a red flag, but it also isn’t cheap enough to feel like a steal.
That makes it a sensible buy if the unit is clean and functional, because the D240 MKII is a respected Audio Research power amp with real tube-era grip, refinement, and plenty of appeal to listeners who want a more open, spacious presentation than many solid-state alternatives. The upside is strongest if the listing includes a known service history, matched tubes, and original packaging or documentation; on an older amp like this, those details matter more than cosmetic niceties.
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.
See all Audio Research listings on RADAR.
