Akai GX-620

• Track System: 4-track, 2-channel stereo/monaural

• Heads: 1 record, 1 playback, 1 erase; GX heads made of crystal ferrite mounted on glass for durability and sound quality

• Motors: 3 motors — 1 capstan and 2 reel motors (eddy current outer rotor type)

• Maximum Reel Size: 10.5 inches

• Tape Speeds: 3¾ and 7½ inches per second

• Frequency Response: 30 Hz to 26 kHz (at 7½ ips)

• Wow and Flutter: less than 0.03% (7½ ips)

• Signal to Noise Ratio: approximately 62 dB

• Total Harmonic Distortion: 0.5%

• Crosstalk: 40 dB

• Inputs: 0.25 mV (line), 2.0 mV (DIN), 70 mV (mic)

• Outputs: 0.775 V (line), 0.3 V (DIN)

• Dimensions: Approximately 443 mm (W) x 475 mm (H) x 228 mm (D)

• Weight: Approximately 22 kg (17.6 kg listed in some sources is roughly 39.2 lbs)

• Features: IC logic-controlled function buttons, capstan servo motor for stable tape transport, sound-on-sound function, adjustable tape tension, and a tape counter located within the transparent head cover.

• Additional: Some models included a remote control option; noted for clear frequency response and high fidelity for consumer/pro audio between 1979 and 1984 with multivoltage power compatibility.

The deck is respected for stable speed control due to its servo capstan motor and high reliability of GX heads, making it suitable for high-quality audio recording and playback.