The Akai GX-630 DB is a vintage reel-to-reel tape recorder that was produced by Akai in the late 1970s. It is known for its high-quality audio playback and recording capabilities. The GX-630 DB features a three-head design for monitoring and playback, as well as a built-in bias oscillator for optimizing tape performance. It has a maximum tape speed of 19 cm/s and can accommodate reel sizes of up to 10.5 inches. The GX-630 DB also includes features like Dolby noise reduction, pitch control, and various input/output options.