Audio Database

The

LUXMAN L-550X
269,000yen(December, 1983 release)

Description
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The Integrated Amplifier of the L-500 X-series which aimed at the overall modification aiming at purification of a grounding circuitry, and fullness of an input system based on L-500 series carrying one-step amplification amplifier.

The Class-A operation method which fixes a bias current is adopted as L-550X, and the one-step amplification which has improved the nakedness property of amplifier by leaps and bounds is further adopted as it.
This one-step amplification has removed the 2nd step, after eliminating the influence of the first rank by being a circuitry which takes out gain equivalent to a multi-stage amplification in one step, and also making an output stage become independent by adoption of the amplification element which was excellent in the nakedness property etc. This has solved problems, such as an ill effect of a power-source noise, and aggravation of the slew rate by high region correction of a stagger.
Moreover, an equalizer part and a power part are made into a symmetrical differential push pull, and the amplifying circuit is stabilized by installing the input in a grounding.

In order to cope with the problem which causes an interference of music signals when changing grounding potential delicately, purification of the grounding circuitry is attained.
First, the power-source criteria amplification which caused a variation from the interior of amplifier was banished, all were constituted from a clean grounding criteria type amplifying circuit, on it, the current loop of the input/output was improved for each amplification system of every, the separation join was carried out, and each amplification system is made independent. Furthermore, it devises to the pattern of a grounding circuitry and criteria potential is fixed.

Head amplifier is carried in order to correspond to MC cartridge.
The low-noise transistor which excels FET in respect of S/N is adopted as the input unit of head amplifier, and the high speed transistor which was excellent in the linearity is carried in the output unit.

The pure Focus capacitor is adopted as the block capacitor of a power-source part.

The linear equalizer is carried and sound-recording frequencies, such as an analog disk which tends to go up or descend toward upper register, can be adjusted. Moreover, it is also possible to rectify the sound field property of a listening room.

Height compass has a selection of nine turnovers possible for a tone control part.

The copper plating is given to the key point of the chassis. thereby an electromagnetic distortion is eliminated.


Rating of a mode
Form Integrated amplifier
Succession effective output 50W+50W (8 ohms, both channel simultaneous drive, 20Hz - 20kHz)
THD 0.008% or less (8 ohms-3dB, 20Hz - 20kHz)
Cross modulation distortion 0.008% or less (8 ohms-3dB, 60Hz:7kHz=4:1)
Input sensitivity Phono MM:2mV
Phono MC: 90 microvolts (direct to an equalizer part)
Tuner, DAD, Line: 150mV
main in:150mV
Input impedance Phono man month: 100 ohms, 50kohm, 100kohm
Phono MC: 40 ohms, 100ohm, 300ohm
Tuner, DAD, Line:40kohm
main in: 47kohm
SN ratio (IHF-A correction) Phono man month: 86dB or more (5mV input)
Phono MC: 80dB or more (250-microvolt input)
Tuner, DAD, Line: 105dB or more (input short-circuit)
main in: 105dB or more
Frequency characteristic Phono man month: Less than [ 20Hz-20kHz}0.2dB ]
Phono MC: Less than [ 20Hz-20kHz}0.2dB ]
Tuner, DAD, Line: 100kHz [ 10Hz - ]-less than 1dB
main in: 100kHz [ 10Hz - ]-less than 1dB
Tone control The maximum variation: }9dB
The point curving [ low-pass ]: 55Hz, 77Hz, 110Hz, 155Hz, 220Hz, 310Hz, 440Hz, 620Hz, 880Hz
The point curving [ high region ]: 620Hz, 880Hz, 1.2kHz, 1.7kHz, 2.5kHz, 3.5kHz, 5kHz, 7kHz, 10kHz
Puri part output pre out:150mV
Attachment
Line phase sensor
Subsonic Filter (15Hz)
A high cut-off filter (9kHz)
Puri heating switchpoint
Warmup indicator
Phone straight switchpoint
Signaloff switchpoint
Linear equalizer
Thon Inn switchpoint
Recording switchpoint
Tapes monitor switch
Tapes dubbing
Speaker selector
Line front jack
Headset jack
Pre-main separation functionality
AC outlet switched: Three lines, max300W
unswitched: One line, max200W
Supply voltage AC100V, 50Hz/60Hz
Power consumption 310W (Electrical Appliance and Material Control Law)
Dimensions Width 453x height 174x depth of 470mm
Weight 20.0kg