Audio Database

The

LUXMAN L-430
99,000yen(September, 1982 release)

Description
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The Integrated Amplifier of the REVOLVER series which supplied the Duo beta technology.

The Duo beta circuit / S of one-step amplification amplifier are carried in the power amplifier part.
A Duo beta circuit / S is with the "one-step amplification amplifier" which makes the amplification stage of an amplifier circuitry only one step, and realizes a low distortion with an open loop,The "Duo beta circuit" which combined DC servo tightened to an amplifier circuitry from the super-low-pass one besides proper-quantity NFB covering all the bands, and an audio frequency band,It is the generic name which summarized three of power circuits "plusX" which gives generous stabilization damping force to a power source,By this, since there are few high region staggers, a stability to the extent that the high region correction by phase gap is not needed is acquired, and also the factor in which a slew rate gets worse in addition to the threshold of an element is lost out of the circuitry inside amplifier, and it is wide opened from the ill effect of Izu of a power source.

After considering it as the highly efficient design of carrying out the specification of the High-Gm low-noise FET developed in MC head amplifier by a differential amplification etc., the Duo beta circuit is carried in the high gain MC equalizer part.
Moreover, the original phone straight functionality is carried, and contact leading about, such as not a mere it1 but light filters, a balance control, and selectors, is put into practice and separated about the disk reflex circuit.

The frequency-shifts type is adopted as a tone control.
Since a variation and the frequency which begins to change interlock and it operates, effective tone control is possible.

Rear

Rating of a mode
Form Integrated amplifier
Effective output 105W+105W (8 ohms, 1kHz, both channel)
THD 0.009% or less (8 ohms-3dB, 20Hz - 20kHz)
Cross modulation distortion 0.009% or less (8 ohms, 60Hz:7kHz=4:1)
Input sensitivity/impedance Phono man month: 2.5mV/50kohm
Phono MC: 100 microvolt/High-Low switching
Tuner, AUX/DAD, Monitor:200mV/40kohm
Main In: 200mV/50kohm
SN ratio (IHF-A) Phono man month: 90dB (input short-circuit, 5mV conversion)
Phono MC: 67dB (input short-circuit, 250-microvolt conversion)
Tuner, AUX/DAD, Monitor, Main In: 110dB
Frequency characteristic Phono: 20Hz-20000Hz}0.3dB
Tuner, AUX/DAD, Monitor, Main In: 10Hz - -100kHz one dB
Tone control }8dB, a turnover shift type
Puri part output 200mV(Pre Out)
Light filter Subsonic Filter: 30Hz
A high cut-off filter: 7kHz
A low boost + 8dB, 70Hz
Tapes monitor Two lines (Tape-1, Tape-2)
Tapes dubbing 1->2, 2->1
Speaker switchpoint Two lines
Power consumption 220W
Dimensions Width 453x height 135x depth of 425mm
Weight 13.5kg