Category:Mid High Fidelity (most Japanese recorders fall into this category)
Country of Manufacture:Japan
Release dates:1974 - 1978
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 4
Head Composition: Permalloy
Head Configuration: Quad
# Motors: 3
Frequency Response:( 3dB): 7½ ips: 20Hz - 20kHz 3¾ ips: 30Hz - 12kHz
Wow and Flutter:less than 0.07% at 7½ ips. less than 0.12% at 3¾ ips
Signal-to-Noise Ratio:better than 60dB (3% THD level to weighted noise level)
Sound quality rating:6 / 10
Long-term reliability rating: 8 / 10
This ‘little brother’ to the quadraphonic QD-5500S had a similar specification but, while stereo record and playback was no problem, only quadraphonic playback was possible.
Features included a 4-channel playback head, stereo record and erase heads, auto-reverse playback (stereo) and a three-motor transport design utilising a belt to link the capstan motor to the capstan/flywheel. All transport controls were of the solenoid-touch type and two tape speeds (7½ and 3¾ ips) were provided. Maximum reel size was 7″.
Tape speed accuracy: within 0.5% / Separation: better than 50dB (between channels at 1,000Hz) / Crosstalk: better than 60dB (between adjacent tracks at 1,000Hz) / Harmonic distortion: playback amplifier: better than 0.15% at 1kHz, 0.47V output tape distortion: better than 3% at 1kHz +6VU / Bias frequency: 100kHz / Erase ratio: better than 60dB / Semi-conductors: 38 transistors, 19 diodes / Rewind speed: approximately 90 seconds for 1200ft / Inputs: microphone: 0.5mV (50kOhm) line: 70mV (100kOhm) DIN: 14mV (100kOhm) / Output levels: 2-channel output: 0.47V maximum (0VU=0.3V) DIN (2-channel): 0.47V maximum (0VU=0.3V) 4-channel output: 0.47V maximum (0VU=0.3V) / Dimensions: 16½ x 22 x 10¼ ” (422 x 554 x 268mm) / Weight: 53.4 lbs (24.2 kg) / quarter-track stereo record