Luxman L 400 (1982–1986)
A solid-state stereo integrated amplifier from Luxman’s Revolver series, produced before the company’s acquisition by Alpine Electronics.
Overview
The Luxman L-400 is a solid-state stereo integrated amplifier, also described as a pre-main amplifier, part of Luxman’s Revolver series. It was produced from 1982 to 1986, with an original release price of ¥59,000 in November 1982. The unit features a built-in high-gain MC equalizer and includes both MM and MC phono input stages. It was designed and built before Luxman was sold to Alpine Electronics.
Specifications
| Power output | 55 watts per channel into 8Ω (63W + 63W at 1 kHz, both channels driven) |
| Total harmonic distortion | 0.02% or Less (8 Ω, -3dB, 20 Hz to 20 kHz) |
| Cross modulation distortion | 0.02% or Less (8 Ω, 60 Hz : 7 kHz = 4 : 1) |
| Input Sensitivity / Impedance | Phono MM: 1.8mV/50k Ω; Phono MC: 250 μV/100 Ω; Tuner, AUX/DAD, Monitor: 160mV/40k Ω |
| Signal-to-noise ratio (IHF-A) | Phono MM: 90 dB; Phono MC: 67 dB; Tuner, AUX/DAD, Monitor: 105 dB |
| Frequency characteristic | Phono: 20 Hz to 20 kHz ± 0.5 dB; Tuner, Aux/DAD, Monitor: 10 Hz to 100 kHz -1.5 dB |
| Tone control | ± 8 dB (100 Hz, 10 kHz) |
| Filter | Subsonic Filter: 30 Hz; High-cut Filter: 7 kHz |
| Low boost | + 7.5 dB, 100 Hz |
| Tape monitor | Two systems (Tape-1, Tape-2) |
| Tape dubbing | 1 → 2 |
| Speaker switch | Route 2 |
| Power consumption | 125W |
| External dimensions | Width 453 × Height 111 × Depth 321 mm |
| Weight | 7.6kg |
Design
The Luxman L-400 is a pre-main amplifier from the Revolver series featuring duobeta technology. The power amplifier section uses a duo-beta circuit, with DC servo applied across the full frequency band to stabilize the sound image and optimize negative feedback, including in the ultra-low frequency range. It includes a turnover frequency shift tone control and a built-in high-gain MC equalizer.
Context
The L-400 belongs to Luxman’s Revolver series, which includes the L-200, L-210, L-220, and L-230. It was designed and built before Luxman’s acquisition by Alpine Electronics.
Market
The Luxman L-400 has appeared on the used market at prices around $500. As a unit approximately 40 years old, potential issues may require diagnosis and servicing, including recapping of the power supply and signal path during restoration.
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