The Sansui AU-α907i MOS Limited Edition integrated amplifier was created to commemorate Sansui’s 40th anniversary, with every aspect of its design—circuitry, mechanical construction, and materials—meticulously refined in pursuit of ultimate performance. Indeed, it was aimed to be one of reference amplifier for Sansui.
It represents one of Sansui’s final and most refined integrated amplifiers from the golden era of Japanese high-end solid-state design. Built as a limited production model, it features Sansui’s advanced MOS-FET output stage combined with the company’s renowned α-X balanced amplifier architecture, resulting in exceptional transparency, control, and musicality.
Sonically, the AU-α907i MOS Limited is admired for its smooth yet highly detailed presentation, offering a natural midrange, refined treble, and authoritative, well-damped bass. It delivers a sound that is powerful without aggression and detailed without sterility—qualities that have earned it strong respect among audiophiles and collectors alike.
Construction quality is exemplary, with a massive power supply, copper-plated chassis sections, precision-matched components, and a layout designed to minimize noise and vibration. This amplifier is equally capable of driving demanding speakers while maintaining composure and tonal balance.
Today, the AU-α907i MOS Limited is considered a highly desirable collector-grade integrated amplifier, valued not only for its rarity but also for its enduring sound quality and unmistakable Sansui sonic character so don't miss this chance !
SANSUI AU-α907i MOS Limited Edition
The Sansui AU-α907i MOS Limited integrates flagship 1987 engineering with Sansui’s α-X balanced circuitry in parallel push-pull using custom MOS FETs for 80W/ch (8Ω) at 0.01% THD and exceptional damping (150).
Key Design Features – Sansui AU-α907i MOS Limited
MOSFET Output Stage (MOS Limited Edition)
Uses carefully selected MOSFET output devices, prized for their smooth, tube-like tonal character combined with excellent speed and control. This contributes to a refined, natural sound with excellent musical flow.
α-X Balanced Circuit Topology
Sansui’s proprietary α (Alpha) balanced amplification architecture minimizes noise and distortion by maintaining symmetrical signal paths. This design significantly improves channel separation, transparency, and low-level detail.
High-Current, Low-Impedance Design
Engineered to deliver strong current capability, allowing the amplifier to drive difficult speaker loads with authority, stability, and excellent bass control.
Over-Engineered Power Supply
Features a large, high-capacity power transformer and generously sized filter capacitors to ensure stable voltage delivery, fast transient response, and consistent performance even at high listening levels.
Discrete, Fully Analog Signal Path
Built entirely with discrete components and no IC amplification stages, preserving signal purity and delivering a more organic, dynamic sound.
Heavy Chassis with Vibration Control
Robust construction with thick panels and internal bracing reduces mechanical vibration and electrical interference, contributing to a cleaner and more focused sonic presentation.
High-Quality Parts Selection
Premium capacitors, resistors, and internal wiring are used throughout, reflecting Sansui’s late-era no-compromise approach to integrated amplifier design.
Direct Signal & Pure Audio Modes
Tone controls and balance circuits can be bypassed to shorten the signal path, maximizing clarity and transparency for serious listening sessions.
Precision Volume Control & Layout
Carefully laid-out internal architecture and high-quality volume control ensure accurate channel tracking and stable imaging at all listening levels.