Kenwood KT-7X
Documentation on the Kenwood KT-7X is thin, and what exists contradicts itself. The two main reference databases disagree on something basic: one lists it as a mono tuner, the other as a stereo tuner. The mono listing gets some support from the FM specs on record. Sensitivity, signal-to-noise and distortion are all labeled "mono" only, and there are no stereo figures anywhere. If the KT-7X was a stereo unit, those measurements were never recorded. Given the era and the product type, the stereo classification looks more likely, but the record doesn't settle it.
Both sources agree on the physical profile. It's a compact, light unit at 330 × 53 × 190 mm and just 2.0 kg, and it draws a modest 8 watts. The tuning range covers FM and MW (medium wave). The FM section is rated at 2.0 µV sensitivity (30 dB S/N), 70 dB mono signal-to-noise, and 0.3% THD. Selectivity is listed at 60 dB, with image rejection at 60 dB and IF/spurious rejection at 90 dB. Output is 1.0 V. The AM side is weaker, with 350 µV/m sensitivity, 58 dB S/N, and 0.8% distortion. The circuit uses 17 transistors and 12 diodes, and the design is described simply as "analog."
A 1984 review in HiFi-Stereo described the KT-7X as a quartz PLL synthesizer tuner with a 12-station memory bank and digital frequency display (HiFi-Stereo, 1984, p.55). No production years, original price, or market positioning have surfaced.
- Type: Stereo tuner (per Audio Database) / Mono tuner (per hifi-wiki.com) — unresolved
- Bands: FM, MW
- FM sensitivity: 2.0 µV (30 dB S/N)
- FM S/N: 70 dB (mono)
- FM THD: 0.3% (mono)
- Selectivity: 60 dB
- Output: 1.0 V
- Semiconductors: 17 transistors, 12 diodes
- Power consumption: 8 W
- Dimensions: 330 × 53 × 190 mm
- Weight: 2.0 kg
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