Technics ST-3200 (1973)
The Technics ST-3200 is a 1973 FM/AM tuner from Technics. It sold originally for ¥49,800. Documentation is thin. Almost everything known comes from a single Japanese spec sheet, and no period reviews or owner impressions have surfaced in the research so far.
That sheet describes a carefully built early-Seventies tuner. Technics said the design goal was better sound quality through “pursuit of waveform transmission.” The front end used four FM and two AM varicon sections, with a three-tuned RF circuit around a four-pole MOSFET. The mixer and local oscillator used low-noise transistors, and the oscillator coil had an aluminum core. The IF stage kept the control and signal systems separate, with three group-delay-flat filters in the signal path and an IC-based control section. The MPX stage used a PLL to regenerate the subcarrier and a double-differential switching IC. The front panel had a high-blend switch and a strength/center-tuning meter. The AM section used a converter, a two-stage IF amplifier, and five tuned circuits. For safety, there were thermal fuses on the primary, secondary, and power transformer.
Known specifications:
- FM: 76–90 MHz; sensitivity 1.8 µV; selectivity 65 dB; capture ratio 1.0 dB; S/N 75 dB; separation 45 dB (1 kHz) / 35 dB (10 kHz); output variable 0–1.5 V, fixed 0.5 V
- AM: 520–1610 kHz; sensitivity 20 µV; selectivity 30 dB
- General: 100 VAC, 16 W; 410 × 140 × 340 mm; 6.9 kg
Don't confuse the ST-3200 with the Technics SL-3200 turntable. It's a completely different machine. A brochure, service manual, or listening notes for the ST-3200 would fill a real gap.
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