Technics ST-9031T (c. 1979)

Not much is documented about the Technics ST-9031T beyond its original specification listing. It was an FM/AM tuner for the Japanese domestic market. The FM tuning range of 76-90 MHz and the 100 VAC power supply give that away. It was priced at ¥39,800 around 1979.

The interesting part is the IF stage. Technics used a SAW filter together with two 4-resonant ceramic filters as the selectivity elements, which likely explains the respectable 75 dB FM selectivity figure. The RF front end used a 4-pole MOS FET and a frequency-linear FM4-series variable capacitor. The MPX stereo demodulator included what the source describes as a jitter-distortion removal circuit, aimed at suppressing high-frequency distortion and improving separation, rated at 50 dB at 1 kHz.

Known specifications:

• FM: 76–90 MHz; usable sensitivity 12.8 dBf (1.2 µV, IHF '58, 75 Ω)
• FM THD (1 kHz): 0.08% mono / 0.1% stereo; S/N 75 dB mono / 70 dB stereo
• AM: 525–1605 kHz; selectivity 40 dB
• Output: 0.6 V
• Dimensions: 430 × 97 × 300 mm; 4.5 kg
• Power: 100 VAC, 50/60 Hz, 12 W

The rest of the record is thin. There are no confirmed production years, no period reviews, and no collector-market data surfaced in the research. Everything above traces to a single database listing.

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