Akai 1730D SS

The Akai 1730D SS is a solid-state, discrete 4-channel reel-to-reel tape deck produced between 1973 and 1976. It is designed for mid to high-fidelity consumer applications and is fully compatible with conventional 2-channel stereo playback.

Technical Overview

• Track System: 4-track, 4-channel stereo/multi-channel system

• Heads: Three permalloy heads – 1 record, 1 playback, and 2 erase heads

• Tape Speeds: 3 3/4 ips, 7 1/2 ips

• Motor: 2-speed hysteresis synchronous motor

• Maximum Reel Size: 5 or 7 inches

• Frequency Response:
  30 Hz to 22 kHz (±3 dB) at 7 1/2 ips
  30 Hz to 15 kHz (±3 dB) at 3 3/4 ips

• Wow and Flutter: Less than 0.15% at 7 1/2 ips

• Signal-to-Noise Ratio: Approximately 48 dB

• Total Harmonic Distortion: Approximately 2%

• Crosstalk: Around 40 dB

• Input Sensitivity:
  Line: 40 mV (100 kΩ)
  DIN: 20 mV
  Microphone: 0.4 mV (30 kΩ)

• Output Voltage: 1.228 V line output

• Output Power: 5 watts

• Dimensions: 450 mm (W) x 420 mm (H) x 240 mm (D)

• Weight: 17 kg

• Equalization: NAB playback/record

• Other Features: Auto shut-off, pause control, four VU meters, reel presser mechanism, front and rear headphone jacks, multiplay capability, rear tape control

Summary

The Akai 1730D SS offers true 4-channel discrete surround recording and playback, with a robust motor system and high-frequency response extending past 20 kHz. It provides solid mid-level performance for quadraphonic recording enthusiasts, with advanced features like auto shutoff and multiple headphone outputs for monitoring. Its sturdy and functional design makes it a desirable vintage deck for collectors and audiophiles interested in early surround sound tape formats.