The Sansui AU-X 901 is an integrated amplifier that was part of Sansui's high-quality audio equipment lineup. It features a dual power supply design, which helps to improve stability and sound quality. The amplifier can deliver a power output of around 150 watts per channel at 8 ohms, making it suitable for driving a variety of speakers. It incorporates a fully complementary push-pull circuit topology for enhanced linearity and fidelity. The AU-X 901 includes multiple inputs, such as phono, line, and tape, allowing for versatile connectivity with various audio sources. Additional features include tone controls, a loudness switch, and a headphone output for private listening. The construction is robust, with a metal chassis that reduces resonance and shield interference. Overall, the AU-X 901 is designed for audio enthusiasts seeking high performance across a wide range of listening scenarios.