The Sansui AU-9900 A is an integrated amplifier that was introduced in the 1970s and is part of Sansui's famous line of audio equipment. It features a robust metal chassis and a distinctive design characterized by its brushed aluminum front panel, which houses various controls and indicators. The amplifier produces a power output of about 100 watts per channel into 8 ohms and boasts low total harmonic distortion. It incorporates a dual power supply for enhanced performance and is equipped with several input options, including phono, tape, and auxiliary inputs. The AU-9900 A also provides tone controls for bass and treble adjustments and features a loudness switch. The build quality is substantial, utilizing high-grade components aimed at delivering exceptional audio fidelity. The amplifier is compatible with a wide range of speakers, making it versatile for different audio setups. Additionally, it has an effective protection circuitry to prevent damage from overheating or short circuits. The design also supports a variety of speaker configurations, allowing users to connect multiple pairs. Overall, the Sansui AU-9900 A is celebrated for its strong performance and aesthetic appeal, attracting audio enthusiasts and collectors alike.