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At US$2,400, this is fair to slightly strong for a D-90B if it’s clean and operating properly; the original D-90B new price was US$2,450 and later US$2,695, while a restored D-90B is commonly discussed around US$2,000–US$3,000. That puts the ask near the middle of the realistic used/restored band, not a bargain-bin score but also not ambitious.
The appeal is real: the D-90B is one of Audio Research’s classic tube power amps, valued for its big, dimensional presentation and the brand’s usual grip, tonal color, and musical flow. If it’s original, well-kept, and includes the right tubes, cage, or other accessories, that supports the price; the main buyer check is condition, because older ARC tube amps can get expensive fast if they need a full service or fresh output tubes.
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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