Akai GX-635D

• Track System: 4-track, 2-channel stereo/monaural system with auto reverse function

• Heads: 6 heads total — 2 record GX heads, 2 playback GX heads, and 2 erase heads, all made with high-quality glass crystal ferrite for durability and sound fidelity

• Motors: 3 motors — 2 reel drive motors and 1 direct drive AC servo capstan motor

• Maximum Reel Size: 10.5 inches

• Tape Speeds: Three speeds — 3¾, 7½, and 15 inches per second

• Frequency Response: 30 Hz to 27 kHz at 7½ ips speed

• Wow and Flutter: 0.04% at 3¾ ips, 0.03% at 7½ ips

• Signal-to-Noise Ratio: Better than 62 dB

• Total Harmonic Distortion: Approximately 0.5%

• Crosstalk: 40 dB

• Inputs: 70 mV (line), 2 mV (DIN), 0.25 mV (mic)

• Outputs: 0.775 V line, 0.3 V DIN, headphone output

• Digital Real-Time Counter: 99 minutes 59 seconds with programmable timer functions for automated recording

• Pitch Control: ±6% speed change for creative playback or recording adjustments

• Dimensions: Approximately 440 mm (W) x 483 mm (H) x 256 mm (D)

• Weight: 21 kg (46.4 lbs)

• Features: IC logic-controlled tape transport functions with feather-touch buttons, electronic brake, auto stop/play/reverse, multi-directional recording capability, and timer-controlled operations.

• Manufactured between 1979 and 1983, representing a mid- to high-end model in Akai's consumer reel-to-reel tape recorder line.

The GX-635D was well-regarded for its precision tape transport system, robust construction, and advanced features such as auto reverse and digital timers, making it popular among audiophiles and semi-professional users.