RADAR is a price search engine. We link to the original listing — we never sell direct. Transactions happen on the source site.
Up for sale is the legendary Audio Research SP-3A vacuum-tube preamplifier. Introduced in the 1970s, this iconic unit is widely considered one of the greatest high-end preamps ever made. It delivers incredible analog warmth, a massive soundstage, and an outstanding phono stage for vinyl lovers.SpecificationsFrequency response: 10Hz to 30kHzTotal harmonic distortion: 0.005%Signal to noise ratio: 70dB (MM), 90dB (line)Channel separation: 30dB (line)Dimensions: 15-5/8 x 5-1/2 x 12-1/2 inchesWeight: 14lbsLocal pick up / inspection / purchase available at Archer High Fidelity in Falls Church, VA. We are a vintage sales and service specialist covering the Washington DC metro area.All major credit cards accepted, as well as PayPal, check on clearing, and Venmo.Any other questions, please feel free to ask.
The SP3 has the right kind of Audio Research cachet: a respected tube-era preamp with real collector appeal and a strong reputation for musicality. At US$3,999, this sits above the US$3,702 75th percentile and looks ambitious versus recent used comps, especially against a US$3,406 median and US$3,109 25th percentile.
That said, it’s still a desirable buy if the unit is genuinely clean and sorted, because these older ARC preamps are prized for their natural midrange, dimensional presentation, and long-term listenability. The upside is strongest if it’s original, complete, and has recent service history or known-good tubes; absent that, age-related maintenance is the main thing to verify before paying top-of-market.
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.
audio-markt.de
Good
SoundTribe Asia
Dealer
Very good
SG
eBay US
Paragon Sight & Sound
Dealer
Hifitörget
SE
eBay UK
GB
