Onkyo Integra T-466NII (1975)
The Onkyo Integra T-466NII is an FM/AM tuner from 1975, part of Onkyo's higher-end Integra line. It sold in Japan at ¥49,000. Little historical context survives. No brochures, no period reviews and no owner impressions have surfaced in the usual places. The spec sheet shows a tuner built with care around basic reception performance, and Onkyo said as much: “An FM/AM tuner designed with an emphasis on basic performance.”
The details back that up. The front end uses a low-noise FET and a frequency-linear four-gang variable capacitor, which gets it to 1.9 µV (IHF) sensitivity. The IF section has a linear-phase ceramic filter and a differential IC for strong limiting. The MPX stage uses a PLL circuit, which is less prone to drift from temperature and humidity than earlier designs, plus a low-pass filter for improved separation. A narrow-type AFC circuit and components less affected by environmental drift were meant to keep tuning stable.
The T-466NII has a multipath output terminal for antenna positioning. It also has a 4-channel detection output to support FM4 (quadraphonic) broadcasting, which dates it firmly to the mid-1970s Japanese FM scene. Outputs are variable and fixed level RCA jacks plus a DIN connector.
The AM section got attention too, with a triple-tuned filter in the IF stage for better selectivity. The chassis is substantial: 467 mm wide, 161 mm high, 383 mm deep, and 8.4 kg, with a wooden cabinet and aluminum front panel. Power consumption is rated at 17W, and there is one unswitched AC outlet (200 VA). It runs on 100 VAC, as you'd expect from a Japanese domestic market unit.
Known specifications:
- **FM section:** 76-90 MHz; sensitivity 1.9 µV (IHF); S/N 73 dB (IHF); capture ratio 1.5 dB; stereo separation 40 dB at 1 kHz; distortion 0.2% mono / 0.4% stereo at 400 Hz
- **AM section:** 535-1605 kHz; sensitivity 200 µV/m (bar antenna); S/N 60 dB
- **Outputs:** variable 0-1.5 V / fixed 660 mV (FM); variable 0-450 mV / fixed 200 mV (AM)
- **Semiconductors:** 2 ICs, 27 transistors (including 2 FETs), 17 diodes
The T-466NII turns up occasionally on Japanese auction sites and Eastern European marketplaces. One Russian listing asked 19,000 ₽. Beyond that, the record is thin. No independent reviews from the period have been located, and no repair or maintenance documentation specific to this model is known to exist.
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