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The Rogue Audio Stereo 90 Super Magnum is the kind of push-pull tube amplifier that makes American hi-fi feel like it has something to prove — and then proves it. Built by hand in Brodheadsville, PA and factory-upgraded with Cardas hardware, HexFred rectifiers, PRP resistors, and polypropylene bypass caps throughout, it arrives with real physical authority: bass that grabs and holds, a midrange that puts the performers right in the room with you, and a treble that stays composed and unhurried no matter the program. Flip it to triode and the whole character softens and blooms — a genuinely different amp, narrower and warmer, more candlelit. The TAS Editors chose it for a reason. This is what 90 serious watts sounds like when someone actually cared about every resistor.S/N: r88-0514
The Stereo 90 has long been Rogue’s appealing high-power tube option: a robust 90-watt KT88/6550 push-pull design with selectable triode and ultralinear modes. At USD 1,399, this is a fair-to-good asking price rather than a clear bargain. Comparable examples have appeared around USD 1,000–1,395, while upgraded Super Magnum versions can command more, so the value depends heavily on tube complement, service history, and whether this is the standard or upgraded model.
Its strengths are real: plenty of drive, a useful 4/8-ohm tap choice, excellent flexibility between sweeter triode and more forceful ultralinear operation, and an onboard bias meter. It makes a particularly sensible partner for moderately demanding speakers and listeners who want tube texture without giving up authority. Confirm that all tubes are healthy and matched, the bias supply and power-supply capacitors have been serviced, and that the cage and original meter function properly; at this price, a clean, fully working example with good tubes is worth serious consideration.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Rogue Audio was founded in 1996 by Mark O'Brien and two colleagues from Bell Laboratories, establishing itself as a Pennsylvania-based manufacturer of high-quality audio electronics. The company, headquartered in Brodheadsville in the Pocono region, has built its reputation on American craftsmanship, with every product hand-built at its own facility. O'Brien, who holds a degree in physics from Cal Poly and previously worked designing laser systems, brought both technical expertise and a commitment to sonic excellence to the venture. The company's founding philosophy centered on creating audio components that the designers themselves would want to own.
Rogue Audio specializes in tube, solid-state, and hybrid audio components across a focused product range that includes integrated amplifiers, power amplifiers, preamplifiers, phono stages, and headphone amplifiers. The brand is particularly known for its vacuum-tube-based designs, which form the core of its engineering identity. The current lineup comprises approximately 16 to 17 models, each engineered with meticulous attention to circuit topology and layout. Notable products include the Cronus integrated amplifier series, which has become a reference point in the mid-to-high-end market.
Rogue Audio occupies a distinctive position as a boutique, high-end manufacturer that prioritizes value and accessibility without compromising sonic performance or build quality. The brand appeals to discerning audiophiles who appreciate American-made tube electronics and sensible pricing relative to performance. Its commitment to local sourcing and manufacturing, combined with a design philosophy rooted in personal conviction rather than market trends, has earned respect among audio enthusiasts and reviewers. Rogue represents the intersection of engineering rigor, tube-amplifier tradition, and practical American manufacturing.
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