Onkyo Integra 712 (1969)
The Onkyo Integra 712 is a pre-main amplifier from the original Integra series. Onkyo introduced that series in September 1969 alongside the Integra 701. The 712 was priced at ¥82,200, which is notably less than the 701. It sat in a lineup that grew to include the 713, 714, 725, 732, and 733 over the following few years. The 712 is described as looking nearly identical to the 701. The most visible difference is a Loudness switch on the front panel where the 701 had an Aux position.
The design is early Integra. Onkyo touted stability in the ultra-low frequency range, achieved with the help of computer-assisted design, and fitted the 712 with a multi-step-up terminal intended for future upgrades. The stepped tone controls are a period curiosity. Bass and treble both switch in 2 dB increments at selectable turnover frequencies (125/250/500 Hz for bass, 2/4/8 kHz for treble) instead of using continuously variable knobs.
The specs are respectable for 1969. Output is 70W + 70W at 0.1% THD, with dynamic power rated at 180W, a damping factor of 100, and signal-to-noise of 100 dB (IHF A) on the main inputs. The phono stage accepts both 50kΩ and 100kΩ loading via a switch, and RIAA deviation holds within ±0.5 dB from 20 Hz to 15 kHz. The unit weighs 15 kg and measures 437 × 136 × 345 mm.
Documentation is thin. No period reviews have surfaced in the archive, and independent measurements are scarce, so the spec sheet above is essentially the manufacturer's own. A German audio forum poster called these old Onkyos "real beauties and superior in quality." Japanese auctions periodically list the 712, sometimes as functional units with power-on confirmed, sometimes as junk.
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