The Akai GX-636 D is a reel-to-reel tape deck manufactured by Akai in Japan. It was produced in the 1970s and is highly regarded for its high-quality audio reproduction. The GX-636 D features a three-head configuration, capable of both recording and playback. It offers four speeds: 3.75 ips, 7.5 ips, 15 ips, and 30 ips. The tape deck also has built-in Dolby noise reduction system for improved audio quality. It has various connectivity options, including line inputs/outputs, microphone input, and headphone output. The GX-636 D is known for its sturdy build quality and reliability.