Akai X-330D

• Track System: 4-track, 2-channel stereo/monaural quarter-track system with cross-field bias recording technology

• Tape Speeds: 1⅞, 3¾, and 7½ inches per second (IPS)

• Maximum Reel Size: Supports up to 10.5-inch reels without special adaptors

• Heads: 4 heads — erase, playback, record, and an additional bias head to enhance high-frequency response

• Motors: 3 motors — a 3-speed hysteresis synchronous motor for capstan drive, and two 6-pole eddy current outer rotor motors for reel drives

• Frequency Response: 30 Hz to 23 kHz (±3 dB) at 7½ IPS

• Wow and Flutter: 0.04% RMS at 7½ IPS

• Signal-to-Noise Ratio: Approximately 50 dB

• Total Harmonic Distortion: About 1.5%

• Power Amplifier: 12 watts RMS per channel, plus two built-in 6 x 4 inch shield-type speakers for monitoring

• Features:
  Automatic continuous reverse operation with program minder (plays entire tape back and forth automatically)
  Magnetic brake with tachometer for fast yet smooth stopping
  Tape counter and remote control capability
  Sound on sound recording modes
  Track selector for easy switching between stereo and monaural modes
  Automatic pinch wheel release and tape lifter during fast wind
  High-quality wooden cabinet with fine oil finish

• Dimensions: Approximately 436 x 375 x 238 mm

• Weight: About 21.5 kg

• Power: Multi-voltage selector (100V to 240V AC, 50/60 Hz)

• Manufacture Period: Circa 1970–1972 in Japan

The X-330D was notable for combining high-fidelity sound with advanced user-friendly features, making it a sought-after reel-to-reel deck for home audiophiles and semi-professional use. It was pioneering in offering 10½-inch reel support without add-ons and continuous auto-reverse operation