Luxman L5 Amplifier

General:

Around 1980 Luxman company came with its L5 hi-quality amplfier on the world markets.

 

Specifications:

Luxman L5 Integrated amplifier effective output:

(both channels driven) minimum 60W+60W RMS (8 ohm, 20Hz - 20kHz)

THD: (20Hz - 20kHz) 0.02% or less (8 ohm, 60W)

IM distortion: (60Hz:7kHz=4:1) 0.02% or less (8 ohm, 60W)

Output bandwidth: 10Hz - 80kHz / -3dB

Frequency range Phono1,2 less than [ 20Hz-20kHz ± 0.5dB ]

Tuner, Aux, Monitor1, 100kHz [ 10Hz - ]-less than 1dB

Main in: 100kHz [ 10Hz - ]-less than 1dB

Input sensitivity/impedance:

Phono1,2:  2.5mV/50kohm

Tuner, Aux, Monitor1,2: 150mV/50kohm

Main in: 1.25V/50kohm

SN ratio (IHF-A correction):

Input short-circuit:

Phono1,2: 80dB or more

Tuner, Aux, Monitor1,2: 100dB or more

Main in: 100dB

Damping factor: 70 (8-ohm, 1kHz)

Tone:

low-pass : 200Hz, 400Hz

high-pass : 2kHz, 4kHz

Filters:

Subsonic: 15Hz-6dB / oct

low cut: 70Hz-6dB / oct.

high cut: 7kHz-6dB / oct.

speaker protection by DC sensing

Overcurrent protection circuit

Audio Attenuator (-20dB)

Tape monitor & cross-tape dubbing

Rec out off-switch

Headset jack

AC outlet

Supply voltage AC-100V/220V, 50Hz/60Hz

Power consumption 170W

Dimensions Width 438x height 105x depth of 313mm

Weight 9.5kg

 

Special futures:

Special tape-dubbing, Tone is defeatable. Subsonic filter. Torodial mains transformer.
This amp is one of the better Luxman amps and has lots of power to supply your speakers.
On a updated L5, I measured 2x75 Watts RMS.

User manual of Luxman L5 click here.
 

Schematic:

Service manual of Luxman L5 click here.

Interior ^
 

Sound:

The L5 is powerfull and the sound is great.

 

Modifications:

Some L5 suffer bad variable resistors for setting DC offset and idling current.
Some caps can be not the best quality and can be replaced.
DC decoupling on the power amp board can possibly be improved.

 

© Hans Hilberink - PE1MMK ® 2003 - Last update: 25-02-2010.