Audio Database

The pictorial image of AU-alpha 907L Extra

SANSUI AU-alpha 907L Extra
250,000yen(around the 1989 time)

Description
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The top Integrated Amplifier of the LExtra series which adopted LAPT of the transistor only for an audio.

In order to improve the linearity in Loule Bell, LAPT (Linear Amplification Power Transistor) newly developed only for the audio is carried.
LAPT has adopted pure-copper material, it put into practice to the bonding wire, and the occurrence of a magnetic distortion is eliminated by becoming nonmagnetic, and while improving sharply and wide-band-izing cut-off frequency by this, the linearity and switching characteristic of a current amplification factor are also improving.

-X balance circuitry is adopted as circuitry. Furthermore, the outstanding high region property is acquired by the NEW diamond differential circuit which made FET of the first rank cascade connection.

The power-source part was placed in the center and the twin monophonic construction which dissociated symmetrically and has arranged the power amplifier part mounted on the large-sized heat sinker is adopted. This cut off the interference of the source of an oscillation which has an ill effect on a tone quality, and the outstanding image orientation is gained.
In AU-alpha 907L Extra, since no vibrating and an absent resonance are put more into practice, pure-copper parts, such as a large-sized insulator of a pure-copper Naked, a LAPT absorber, the transformer base, have been adopted.

The power-source part has a balance power-source structure, and is stopping various ill effects by considering it as the closed loop which became independent of a grounding.
Moreover, the large-sized transformer of the new development which enclosed the high-density fill, a power source capacitor, first recovery diode, etc. adopted the newly developed custom-made thing, and low-impedance-izing and high speed-ization are realized.

The part selected carefully until music signals, such as a capacitor, a resistor, a semiconductor, and a coil, resulted in each of parts centering on the part passed directly is adopted.

The phone equalizer of a full-scale discrete stream composition is carried in the equalizer part.

The balance input is carried.

Functionalities, such as a power amplifier direct, a Source Direct, and an REC serector, are carried.

The 6-unit Detent volume is carried in the volume.

Internal A
LAPT
Using Pure-copper

Rating of a mode
Form Alpha-X balanced, NM-LAPT, and amplifier
<Power amplifier part>
Effective output (20Hz - 20kHz)
Both channel drive
190W+190W (6ohm)
160W+160W (8ohm)
Dynamic power 580W (2ohm)
390W (4ohm)
310W (6ohm)
THD (at the time of an effective output) 0.003% or less (8ohm)
Cross modulation distortion 0.003% or less (8ohm)
Dumping factor 150 (8ohms)
Frequency characteristic (1W) DC-300kHz+0 -3dB
Input sensitivity/impedance 1V / 3kohm (1kHz)
SN ratio (A network) 120dB or more
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate 200v/microsec
Rise time 0.5microsec
<Pre part>
Input sensitivity/impedance
(1kHz)
Phono man month: 2.5mV / 47kohm
Phono MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape/DAT1, 2 or 3:150mV / 20kohm
Phono maximum permissible input MM(THD 0.01%):250mV
MC(THD 0.1%):25mV
Frequency characteristic Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, Tape/DAT1, 2, and 3:DC-300kHz+0 -3 dB
SN ratio Phono man month: 90dB or more
Phono MC: 75dB or more
compact disk, Tuner, Line, Tape/DAT1, 2 or 3:110dB or more
Tone control Bass: }5dB (50Hz)
Treble: }5dB (15kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness + 4dB (50Hz), +3dB (10kHz)
<Synthesis>
Power dissipation 400W
Dimensions Width 472x height 164x depth of 450mm
Weight 33.0kg