Technics ST-2400 (c. 1977)

The Technics ST-2400 is a Japanese-market FM/AM tuner. Its only date is its original price of ¥21,800, which the surviving record places "around 1977." Documentation is thin. No production years, no brochure copy and no period reviews have surfaced. The spec sheet that survives shows a competent, no-nonsense tuner.

The FM tuning range of 76-90 MHz tells you it was built for domestic Japanese sale, not export. The figures are respectable for the late '70s: 0.9 µV practical sensitivity (75Ω), 60 dB selectivity, a 1.0 dB capture ratio, 74 dB signal-to-noise ratio, and stereo separation of 41 dB at 1 kHz. The AM section covers 525-1605 kHz with a 250 µV/m sensitivity. Output is 600 mV and power consumption is 6 W. The unit measures 415 × 105 × 250 mm and weighs 2.7 kg. The only design detail the record preserves is that the front panel carries both a signal meter and a tuning meter.

Beyond that, almost nothing is documented. A single used listing on a hifi forum shows one example changing hands in 6.5/10 condition, marked sold with no price disclosed. That, plus the spec sheet, is the whole surviving record: a modest, late-'70s Japanese-market Technics tuner with solid numbers and almost no paper trail.

FM/AM tuner, Japanese market (FM 76–90 MHz)
FM sensitivity 0.9 µV (75Ω); selectivity 60 dB; capture ratio 1.0 dB
FM S/N 74 dB; separation 41 dB (1 kHz)
AM 525–1605 kHz; sensitivity 250 µV/m; selectivity 22 dB
Output 600 mV; power consumption 6 W
Dimensions 415 × 105 × 250 mm; weight 2.7 kg
Signal meter and tuning meter
Original price ¥21,800 (c. 1977)

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Technics ST-2400 (c. 1977)

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