The Sansui AU-D 607 F is an integrated amplifier belonging to Sansui's distinguished 07 series, produced from 1979 to 1980 in Japan. It features a unique Super Feed-forward System, which combines traditional negative feedback (NFB) with feedforward technology to significantly reduce distortion, enhancing audio fidelity. This amplifier is equipped with a diamond differential circuit for accurate current delivery during transient music signals. It utilizes a simple, efficient signal flow design with three-dimensional wiring to minimize signal path length, promoting cleaner audio output. The power supply system is robust, featuring a dual independent power supply with a custom 32,800 μF capacitor that ensures stability and responsiveness to transient demands. Other specifications include a DC servo system that eliminates the need for output capacitors, and a switching mechanism for MM/MC input configurations. A subsonic filter, tape monitor, and various control options enhance its functionality, while the build quality benefits from wooden bonnets and high-grade materials to reduce magnetic interference.
