Akai 1800

The Akai X-1800, also known as the Akai X-1800 SD, is a combined stereo reel-to-reel tape recorder with an integral 8-track cartridge recorder produced from around 1969 to 1972. It is a versatile unit designed for both reel-to-reel and cartridge recording/playback.

Key Technical Specifications

• Track System: 4-track, 2-channel stereo/monaural reel-to-reel system coupled with an 8-track cartridge recorder

• Tape Speeds: 1 7/8, 3 3/4, 7 1/2, and optionally 15 ips (with adapter)

• Motor: Single-speed induction motor with two-speed capability for tape transport

• Heads: Three permalloy heads (one record, one playback, one erase)

• Maximum Reel Size: 7 inches

• Frequency Response (Reel):
  7 1/2 ips: 30 Hz to 23 kHz (±3 dB)
  3 3/4 ips: 30 Hz to 18 kHz (±3 dB)
  1 7/8 ips: 30 Hz to 9 kHz (±3 dB)

• Wow and Flutter: Less than 0.12% at 7 1/2 ips, less than 0.15% at 3 3/4 ips, less than 0.2% at 1 7/8 ips

• Signal-to-Noise Ratio: >50 dB (reel), >45 dB (cartridge)

• Distortion: <2% for reel, <3% for cartridge at 1 kHz 0 dB

• Amplifier Output Power: 4 W RMS per channel into 8 ohms

• Speakers: Two built-in 4" speakers for stereo monitoring

• Inputs: Microphone (0.5 mV, 50 kΩ), Line (60 mV, 150 kΩ)

• Outputs: Line (1.23 V at 0 VU, 100 Ω), Headphone (150 mV at 8 Ω), Extension speakers (6 W, 8 Ω)

• Rewind Speed: 150 seconds for 1200 ft tape (reel)

• Dimensions (WxHxD): 381 × 343 × 241 mm (15" × 13½" × 9½")

• Weight: 17 kg (37.4 lbs)

• Power Consumption: 60 W

• Power Supply: Multi-voltage switch 100–240 V AC, 50/60 Hz

• Equalization: NARTB-standard NAB playback and recording curve

Features and Notes

• Combines reel-to-reel and 8-track cartridge recording and playback capabilities.

• Uses the Akai patented crossfield sound head system for improved frequency response and sound quality.

• Offers pause control, input mixing, and monitoring functions.

• Portable design with built-in amplifier and speakers.

• Highly regarded for its frequency response and low distortion.

• Provided with various inputs and outputs for flexible integration.

This model offered excellent versatility and sound quality for the period. It was designed for serious home audio enthusiasts wanting both reel and cartridge recording/playback in one unit.