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Superb condition Quicksilver Audiophile LinestageComes with factory remote and an extra set of tubesFactory boxingWill be double boxed to insure safe delivery
At US$599, this sits well above the median used asking price of US$244 and also above the 75th percentile of US$626 only by a small margin, so it reads as a premium but not outrageous ask for the right buyer. It is not a bargain, but it is still within the upper end of the normal market for this kind of piece.
The upside is the appeal of a respected tube linestage: if this Quicksilver is in genuinely clean working order, it should offer the open, dimensional, full-bodied sound that keeps people loyal to good tube preamps. That kind of piece can be a strong long-term keeper if it’s quiet, has healthy tubes, and includes the remote and any original packaging; at this price, completeness and condition matter a lot more than hype.
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.
