Akai GX-1900D

• Track System: 4-track, 2-channel stereo/monaural system for the open reel; cassette is 4-track, 2-channel stereo

• Heads: 1 record/playback head and 1 erase head, both permalloy

• Motor: 2-speed motor with hysteresis synchronous operation

• Maximum Reel Size: Up to 7 inches

• Tape Speeds: 3¾ and 7½ inches per second

• Wow and Flutter: 0.12% at 7½ ips

• Frequency Response: 30 Hz to 22 kHz (±3 dB at 7½ ips)

• Signal-to-Noise Ratio: Approximately 50 dB or more

• Total Harmonic Distortion: About 2%

• Crosstalk: 45 dB

• Inputs: 50 mV (line), 3 mV (DIN), 0.5 mV (mic)

• Outputs: 1.228 V line output (0 VU), headphone output 30 mV / 8Ω

• Dimensions: 375 x 435 x 248 mm (14.8 x 17.1 x 9.8 inches)

• Weight: 18.4 kg (40.5 lbs)

• Additional Features: Two-way transfer between cassette and reel, large illuminated VU meters, auto stop and shut off, tape lifters for winding, pause/start buttons

• Semiconductor Components: 16 transistors, 2 integrated circuits, 7 diodes

• Power Supply: AC 100V to 240V, 50/60Hz, 60 W power consumption

• Manufacture Period: Early to mid-1970s, made in Japan

• Market Position: Mid-high fidelity consumer combination reel/cassette stereo tape recorder

This deck was notable for its combination capability, practical layout, and robust recording/playback performance given its consumer market positioning. The cassette unit employed Akai's GX heads for recording/playback, but these were not used on the reel section.