Kenwood KT-880F (1985)
The KT-880F is a quartz-synthesizer FM/AM tuner Kenwood released in 1985 at ¥45,000 in Japan. It was the junior model in its line, sitting below the top-tier KT-1100. An owner on drive2.ru paired it with a "thousand-series" Kenwood amplifier because the matching flagship tuner was both expensive and rarely appeared for sale.
The interesting part is Kenwood's "4D System" - four proprietary circuit approaches aimed at reducing distortion. The tuner uses a direct linear reception circuit, a direct linear loop detector, and a newly developed DPD (direct pure decoder) MPX stage for stereo demodulation. A distortion-correcting circuit extracts and cancels the harmonic distortion generated by the steep IF filter. Dual-gate MOS FETs go in the RF amplifier and MPX sections to improve intermodulation characteristics. The specs back it up: mono THD at 1kHz is rated at 0.006%, and signal-to-noise at 98dB mono / 88dB stereo.
This is a Japanese-market tuner through and through. The FM band covers 76-90 MHz, the "island range" as the drive2.ru owner called it, and he noted that the frequency-range modification is a known and treatable "ailment." It draws just 10W, weighs 3.3kg, and measures 440 × 67 × 319 mm. Features include 16-station random presets, one-touch auto-tuning, timer-linked recording of three stations, and a −6dB rec calibration at 100% modulation.
Surviving information is thin. Most of what's documented comes from the Japanese Audio Database spec sheet and a single Russian owner post. There is no service manual, no detailed repair history and no long-term reliability data. What the record shows is a well-specified mid-tier tuner from Kenwood's mid-'80s Japanese lineup, one that a single owner bought at auction to complete his stack. A used listing on the German site Kleinanzeigen appeared in August 2025 at €30.
Known Specifications
- Type: Quartz synthesizer FM/AM stereo tuner ("4D System")
- FM range: 76–90 MHz (Japanese domestic band)
- AM range: 531–1602 kHz
- Sensitivity (75Ω): 0.95 μV / 10.8 dBf
- THD (mono, 1kHz): 0.006%
- S/N (85 dBf input): 98 dB mono / 88 dB stereo
- Stereo separation (1kHz): 68 dB
- Output: 0.6V / 3.3kΩ (FM), 0.18V / 3.3kΩ (AM)
- Power consumption: 10W (100 VAC)
- Dimensions: 440 × 67 × 319 mm
- Weight: 3.3 kg
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