The Akai GX-630 D is a reel-to-reel tape recorder manufactured by Akai. It was produced during the 1970s and is known for its high-quality audio playback and recording capabilities. The GX-630 D features three motors (dual-capstan drive and a direct-drive motor for the tape counter) for smooth and consistent tape transport. It has two speeds, 3.75 and 7.5 inches per second, and can accommodate both 7-inch and 10.5-inch reels. The GX-630 D also includes a built-in amplification system and various audio controls for adjusting playback and recording levels. Other notable features include automatic reverse playback, tape counter, and VU meters for monitoring audio signal levels. The unit is highly regarded by audio enthusiasts and collectors for its durability and sound quality.