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Is this the kind of piece you want because it’s a bargain, or because it’s genuinely special? At US$999, this is well above the recent used median of US$238 and even past the US$743 75th percentile, so it reads as ambitious rather than fair-market for a typical comparable listing.
That said, this kind of vintage NAD-related phono piece can earn its keep if it’s clean, original, and properly serviced, because the appeal is in that punchy, musical, very listenable presentation. The upside here is condition and originality: if it really is original and in strong working order, the premium is tied to desirability, not just age. Still, at this price, a buyer should want proof of a recent test, intact controls, and no noise or channel imbalance.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Quantum Science Audio (QSA) emerged in early 2020 under the leadership of Steven Tsang, an electronic engineering expert with deep roots in audio consulting. Based in Scottsdale, Arizona, with ties to Hong Kong where Tsang honed his expertise, the brand quickly carved a niche through relentless innovation in power components. Drawing from over two decades of proprietary research, QSA embodies a fusion of technical discipline and audio obsession, prioritizing subtle yet profound system enhancements.
The company's focus centers on high-performance aftermarket fuses, including thermal, slow-blow, automotive, and specialized AC variants like inlets, outlets, and panel breakers. QSA also extends into power receptacles and related accessories, all engineered to eliminate so-called "bottlenecks" in signal paths. Their lineup spans accessible entry points at around $28 to ultra-premium models commanding exorbitant prices, reflecting escalating tiers of advanced materials and quantum-inspired treatments.
In the hi-fi market, QSA occupies a polarizing boutique position among high-end enthusiasts, celebrated by some for transformative sound improvements in power delivery. Top models attract audiophiles chasing marginal gains, though skeptics dismiss the claims as overreach amid long production lead times. This niche status suits discerning buyers open to experimental upgrades in an otherwise crowded field.
See all Quantum Science Audio listings on RADAR.
