Kenwood KT-3030 (1984)
The KT-3030 is an FM-only synthesizer tuner. Kenwood sold it in 1984 as a high-end model, priced at ¥120,000, mostly in Japan. The whole design goes after one problem: signal-to-noise gets worse at the low end of the FM band on synthesizer tuners. On a conventional design, plot local oscillator frequency against tuning voltage and you get a curve, gentle around 90 MHz. Kenwood's fix was a "direct-linear reception circuit" with a parallel twin circuit, 12 varicaps and a MOS FET oscillator. It keeps the tuning voltage swing linear across the whole band. The numbers are impressive even by today's standards: mono signal-to-noise of 99 dB, stereo separation of 71 dB at 1 kHz in Wide mode, and distortion around 0.004% at 1 kHz mono.
The rest of the signal path is just as elaborate. The IF stage uses a DLLD (Direct Linear Loop Detector), which linearizes the IF signal and detects it with a closed-loop circuit. A DCC (Distortion Collecting Circuit) cancels 2nd through 4th order distortion from the IF filter. The stereo decoder is a DPD (Direct Pure Decoder). It multiplies the detection output by a pure 38 kHz sine wave with no harmonic components, which avoids the low-pass filter and phase rotation that hurt lesser designs. There's a four-position IF band switch (Super Narrow / Narrow / Wide / Super Wide), an RF selector for DIRECT/DISTANCE, and a multipath terminal, which one owner noted is unusual on a digital tuner. The front panel is thick hairline aluminum. The whole thing weighs 4.6 kg.
Cosmetically, it's nearly identical to the cheaper KT-2020 (¥75,000). At least one owner complained mildly that Kenwood should have set the pricier unit apart more. The power supply board is believed to be shared with the KT-2020 as well. The export version was sold as the KT-1100SD.
Most of what's known about real-world performance comes from a detailed 2015 repair-and-restoration write-up by a Japanese technician (hirokun.jp). Before repair, the unit sounded "sweet, un-Kenwood-like," with weak separation and audible distortion on time-signal tones. The overhaul replaced all 15 tact switches, reflowed a solder crack at the fluorescent display joint, cleaned the output level volume, and adjusted trimmers. His verdict afterward: "the famous classic unit has been fully revived." Sensitivity and interference rejection are described as excellent. The noise is clean and white-noise-like, so even weak stations are listenable. The same owner measured post-repair separation at 1 kHz from 55 dB (Super Narrow) to 69 dB (Wide). A later owner comment from 2018 noted that tuning drifts with age and the manufacturer no longer services the unit.
One quirk: the KT-3030 has no forced mono function, and muting takes about two seconds when you change stations. The tuning knob is digital rotary, with 16 presets split across two banks (A and B), plus a 4-station program function for timer recording.
Known specs:
- FM tuning range: 76–90 MHz (Japan)
- Sensitivity (IHF, 75Ω): 0.95 μV / 10.8 dBf (Distance); 5 μV / 25.2 dBf (Direct)
- S/N ratio (100% mod, 85 dBf): 99 dB mono / 91 dB stereo
- Selectivity (IHF): 70 dB Wide / 100 dB Narrow
- Frequency response: 20 Hz–15 kHz ±0.5 dB
- Outputs: Fixed 0.6V/2.3kΩ; Variable 1.2V/1kΩ; Multipath (V and H)
- Dimensions: 440 × 88 × 326.5 mm; 4.6 kg
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