The Akai GX-625 D is a reel-to-reel tape deck manufactured by Akai in the 1970s. It was part of the GX series and was designed for professional use. The GX-625 D features 3-motor transport and a direct-drive capstan motor for precise tape speed control. It operates at speeds of 7.5 and 15 inches per second. The tape deck has adjustable bias and equalization settings for optimal recording and playback quality. It also includes features like auto-reverse playback, tape tension control, and built-in VU meters for monitoring signal levels.