The Hitachi HTA-4000 is an integrated amplifier produced in the 1970s, notable for its robust construction and vintage audio appeal. It features a classic design with a metal chassis, large knobs for volume and tone control, and a user-friendly layout. The amplifier is characterized by its high power output, which is suitable for driving a wide range of speakers. The HTA-4000 supports a variety of input sources, including phono, tuner, and auxiliary, allowing users to connect multiple audio devices. Additionally, it includes tone controls for bass and treble adjustments, providing flexibility in tailoring sound to listener preferences. The unit also has speaker selector options and a headphone output, which enhances its versatility for different listening environments. Overall, the HTA-4000 is appreciated by audio enthusiasts for its vintage charm and solid performance.