Luxman P-405 (c. 1983–1985)
The Luxman P-405 is a stereo power amplifier from Luxman's early-1980s separates line. It was designed as the companion to the C-405 preamplifier. Sources agree it was built on a dual-mono basis, with a toroidal power transformer and a large capacitor bank. The signal path is DC-coupled, with no coupling capacitors. The output stage uses Luxman's own "LEC" (Luxman Emitter Coupled) devices. The input stage is hard-wired point-to-point, and there is an isolated input board with a ground terminal.
Rated output is 120W RMS per channel into 8 ohms and 150W into 4 ohms, both at 0.02% THD. Frequency response is specified from DC to 100kHz. Signal-to-noise ratio is better than 115dB and damping factor is greater than 100. Input sensitivity is 1V for rated output, and input impedance is 50k ohms. It weighs 8.5kg and measures 424 × 84 × 330mm. You get two pairs of speaker terminals and a single unbalanced RCA input pair. There are also output protection and diagnostics relays.
A tech review at Vintage Audio Workshop says: "The P-405 is a very clean, neutral and dynamic amplifier. It does not add a 'flavor' - it just plays the music." Owners consistently note its grip and control of loudspeakers. The usual aging issues apply. Capacitors may need replacement, and the protection relay contacts can pit over time. The small signal relays are reportedly difficult to source today, so a modern equivalent is recommended when servicing. A service manual is available at HiFi Engine, and period brochure scans survive at Vintage Audio Workshop.
No original price has been found in the available documentation. Production year claims of 1983-1985 rest on a single source, and other references simply say "early 1980s."
- Output: 120W RMS/ch into 8Ω (0.02% THD); 150W RMS/ch into 4Ω
- Frequency response: DC–100kHz
- S/N ratio: >115dB
- Damping factor: >100
- Input sensitivity: 1V; input impedance: 50kΩ
- Dimensions: 424 × 84 × 330mm; weight: 8.5kg
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