The Akai 3000 D is a vintage reel-to-reel tape recorder manufactured by Akai in the 1960s. It is a compact and portable tape machine that offers high-quality audio recording and playback. The 3000 D features a 4-track system and operates at a speed of 7.5 or 3.75 inches per second. It uses 7-inch reels and supports both mono and stereo recordings. The tape recorder has a built-in amplifier and speaker, as well as various control knobs for adjusting the recording levels and playback settings. It is known for its solid construction and reliable performance.