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• Overview – The Audio Research VSI55 Tube Integrated Amplifier, released in 2006, is a Class AB tube integrated amplifier using KT88 output tubes, featuring a pure analogue signal path without DAC or phono stage.
• Tube Amplification Character – Delivering classic Audio Research sonics, the Audio Research VSI55 Tube Integrated Amplifier offers open midrange, harmonic richness, and refined treble with excellent musical flow and natural tonal balance.
• Build & Circuit Design – The Audio Research VSI55 Tube Integrated Amplifier employs a fully discrete valve circuit with high-quality transformers, ensuring stable operation, low distortion, and consistent performance across various loudspeaker loads.
• Specifications – 50W per channel into 8 ohms, Class AB push-pull tube design, KT88 output tubes, frequency response 10Hz–40kHz, input impedance 300k ohms, multiple line-level inputs, no internal DAC or phono stage.
• Dimensions – Approximately 483 mm (W) × 178 mm (H) × 381 mm (D), with an open-top chassis design allowing proper heat dissipation and easy tube access.
• Weight – Approximately 22 kg, reflecting heavy-duty output transformers, solid chassis construction, and robust power supply required for stable tube amplifier operation.
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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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