ONKYO Integra 1631
¥ 85,000 (around the early 1970 s?)
Commentary
A preamplifier incorporating a surround composer capable of upgrading from 2 ch to 4 ch in the preamplifier section of Integra 733.
Input terminal for discrete 4 ch is mounted.
Model Rating
| Type | 4-channel surround preamplifier |
| Input Sensitivity / Impedance | Phono1 : 2.4mV/30k Ω, 50k Ω Phono2 mm : 2.4mV/50k Ω Phono2 MC : 100 μ V/80 Ω Tuner, AUX, Play : 100mV/100k Ω |
| Total Harmonic Distortion Factor (1 v, 1 khz) | Not more than 0.03% Matrix:0.05% |
| RIAA deviation (30 Hz to 15 kHz) | Within ± 0.5 dB |
| Maximum Allowable Input (1kHz/10kHz) | MM:210mV/980mV MC:9mV/41.5mV |
| Signal-to-noise ratio (IHF A network) | Phono1, Phono2 MM : 75 dB or more Phono2 MC : 55 dB or more |
| Tone Control (2 db Step Type) | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
| External dimensions | Width 437x Height 136x Depth 345 mm |
| Weight | 8kg |