Luxman T-660 (1974)
The Luxman T-660 is an AM/FM stereo tuner released in October 1974 at ¥49,800. It looks different from other Luxman tuners. One Japanese owner noted that its design is exceptionally atypical among them, and that its exterior condition remains good enough for active use decades on.
The FM section is where Luxman put the engineering. The front end uses a four-gang variable capacitor with a FET high-frequency amplifier, an interstage double-tuned circuit, and a separate mixer and oscillator stage. The IF amplifier has two pairs of linear-phase ceramic filters, plus an LC double-tuned circuit and a wide-band discriminator transformer. The MPX section uses a phase-locked-loop IC that automatically compensates for phase shifts, which prevents distortion and separation degradation. The muting circuit is all-electronic and FET-based, set at ±50 kHz, and makes almost no pop noise when switched on or off. A high-blend circuit, a multipath detection terminal, and an output level control round out the features. The AM section is simpler. It has a two-gang varicon, no RF amplifier stage, and a ceramic filter in the IF path.
The power supply is a constant-voltage design with a ripple filter circuit.
Known specifications:
- FM practical sensitivity (IHF): 2 μV (83 MHz, 100% mod)
- FM two-signal selectivity: 60 dB (±400 kHz)
- FM capture ratio: 1.8 dB
- FM S/N (mono): 70 dB
- FM THD: 0.3% mono, 0.4% stereo
- Stereo separation: 40 dB (400 Hz), 30 dB (50 Hz–10 kHz)
- FM output: 1.6 V (400 Hz, 100% mod, mono)
- AM practical sensitivity (IHF): 230 μV/m
- AM output: 450 mV (400 Hz, 30% mod)
- Dimensions: 443 × 153 × 273 mm; 6.7 kg
- Semiconductors: 24 transistors, 2 FETs, 2 ICs, 21 diodes
Documentation on this model is thin. No period reviews have surfaced, and most of what's known comes from Japanese equipment databases. No production end date, market context, or common failure modes are recorded. The secondary market shows occasional listings in Japan, Korea, and Russia, and at least one Korean classified ad specifically seeks a T-660.
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