Luxman L-509F (1993–1998)

Name: Luxman L-509F
Brand: Luxman

A high-end integrated amplifier from Luxman’s F-series, combining powerful output with low distortion and refined circuit design.

Overview

The Luxman L-509F is an integrated amplifier produced from 1993 to 1998. It was the top model in Luxman's 'F' series, designed for audiophiles seeking a balance of musicality and technical performance. The amplifier delivers 100 watts per channel into 8 ohms and is built around Luxman’s ODNF (Only Distortion Negative Feedback) circuit topology, which contributes to its exceptionally low distortion.

Specifications

Model	L-509F
Manufacturer	Luxman
Product type	Integrated amplifier
Production years	1993–1998
Power output	100W + 100W (8Ω)
Total harmonic distortion	0.007%
Frequency response	20Hz – 20kHz
Input sensitivity (Phono MM)	2.5mV
Input sensitivity (Phono MC)	0.25mV
Input sensitivity (Line)	150mV
Signal-to-noise ratio (Phono MM)	90dB
Signal-to-noise ratio (Phono MC)	74dB
Signal-to-noise ratio (Line)	106dB
Dimensions (W × H × D)	458 × 156 × 428 mm
Weight	22.0kg

Design

The L-509F features a double-layer chassis constructed with a 2mm thick steel plate and a 1.6mm thick aluminum plate for rigidity and vibration resistance. It uses a large 600VA EI-type power transformer and a power supply section with two 22,000μF capacitors to ensure stable operation. The volume control is a high-quality ALPS motor-driven potentiometer, and the circuit employs Luxman’s proprietary ODNF (Only Distortion Negative Feedback) design to minimize distortion.

Context

The L-509F was positioned as the flagship model of Luxman’s 'F' series, reflecting the brand’s focus on high-fidelity performance and balanced sound reproduction. It is recognized in the Classic Models Reference as a notable amplifier from the brand’s 1990s lineup.