Kenwood L-03A (1983)
The Kenwood L-03A is an integrated stereo amplifier launched in 1983 as part of Kenwood's top-tier L-series. It was a high-powered machine for its day. It was rated at 150W + 150W into 8 ohms (20 Hz-20 kHz), with dynamic power figures of 230W into 8 ohms and 340W into 4 ohms. Maximum instantaneous output was rated at 340W + 340W into 4 ohms and 430W + 430W into 2 ohms. Total harmonic distortion was claimed at 0.003% at rated output, and the damping factor was rated at 2,000. Those are flagship numbers.
The L-03A was built around what Kenwood called a "dynamic linear drive" circuit, designed with digital audio sources in mind. The output stage used two amplifiers. A low-power, high-quality amplifier handled up to 50W for most of the signal path. A high-power amplifier backed it up and engaged only on instantaneous large signals. This was said to reduce source impedance and keep distortion low regardless of speaker load fluctuations. A related "Σ drive" system drove the speakers with a signal shaped to match the amplifier's input waveform. The phono stage used a dual-head equalizer design - FET-based for MM cartridges, transistor-based for MC - with RIAA deviation of ±0.2 dB from 20 Hz to 20 kHz.
Other features include a super-linked volume control, fader-touch volume, gold-plated RCA jacks, NF-CR type tone controls with a tone-off circuit, front and rear AUX inputs with a changeover switch, and pre-out/main-in terminals. The chassis was copper-plated in places, part of Kenwood's effort to reduce magnetic distortion.
Documentation on the L-03A is thin outside of its spec sheet. One French forum post from a buyer put the cost at "almost 300 euros net of exchange with shipping" and, figuratively, said it cost "an arm, up to the elbow." The original price in Japan was ¥180,000. A Russian seller's listing notes the unit runs on 100V AC, weighs 15 kg, and measures 440 × 158 × 383 mm. The same seller calls it "made with maximum quality" and says it is "perfectly preserved, which is extremely rare." No independent reviews, measured tests from period publications, or detailed repair information have surfaced in the record.
Known specs, such as they are:
- Integrated stereo amplifier, 1983, Japan
- Original price: ¥180,000
- Rated output: 150W + 150W (8 Ω, 20 Hz–20 kHz); 200W + 200W (4 Ω, 1 kHz, 0.003% THD)
- Dynamic power: 230W + 230W (8 Ω); 340W + 340W (4 Ω)
- THD: 0.003% (8 Ω, rated output)
- Damping factor: 2,000 (55 Hz, 8 Ω)
- S/N ratio: 110 dB (Tuner/Aux/Tape); 88 dB (Phono MM); 71 dB (Phono MC)
- Input sensitivity: 150mV/47k Ω (line); 2.5mV/47k Ω (MM); 0.1mV/100 Ω (MC)
- Frequency response: DC–200 kHz (−3 dB)
- Dimensions: 440 × 158 × 383 mm; weight: 15 kg
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