Technics ST-8075 (c. 1977)
Not much is documented about the Technics ST-8075. What survives is mostly a specification sheet and a few circuit notes. They show a serious FM/AM tuner that sold for ¥42,800 in Japan around 1977. The 76-90 MHz FM band and 100 V AC supply mark it as a Japanese domestic model. It is a dedicated tuner, not a receiver, with a variable 0-0.8 V line output and no amplifier section.
The design notes are the interesting part. The front end used two dual-gate junction FETs in a two-stage RF amplifier, paired with an FM-4 series variable capacitor, to reduce the influence of radio noise. The IF stage ran three ceramic filters chosen for good group-delay characteristics. The rated figures were respectable for the era: 10.3 dBf usable sensitivity, 75 dB mono signal-to-noise, 75 dB selectivity, and 1.0 dB capture ratio, with 0.15% mono and 0.3% stereo distortion. Stereo separation was rated at 45 dB at 1 kHz.
Known specifications:
- FM: 76–90 MHz; AM: 525–1605 kHz
- FM sensitivity: 0.9 µV (75 Ω) / 10.3 dBf (new IHF)
- Distortion: 0.15% mono, 0.3% stereo
- S/N (mono): 75 dB; capture ratio: 1.0 dB; selectivity: 75 dB
- Stereo separation: 45 dB (1 kHz), 35 dB (10 kHz)
- AM sensitivity: 30 µV (S/N = 20 dB)
- Output: variable, 0–0.8 V, plus a 440 Hz recording-level check signal
- Power: 100 V AC, 12 W
- Dimensions: 450 × 140 × 304 mm; 6.7 kg
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