Audio Database

The pictorial image of AU-alpha 707L Extra

SANSUI AU-alpha 707L Extra
145,000yen(around the 1989 time)

Description
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The Integrated Amplifier which adopted LAPT of the transistor only for an audio based on AU-alpha 707Extra.

In order to improve the linearity in Loule Bell, LAPT (Linear Amplification Power Transistor) newly developed only for the audio is adopted.
At LAPT, cut-off frequency is improved also 3 times of elegance 50-60MHz and conventionally by having adopted pure-copper material, eliminating an occurrence of a magnetic distortion by becoming nonmagnetic thoroughly until it results in a bonding wire, and improving the internal structure of an element.

-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.

A balance transmit and an amplification are possible even for a speaker from the source by connecting the compact disk player which carried the balance input and carries a balance output.

The balance power source is adopted as a power-source part, and various ill effects are stopped by considering it as the closed loop which became independent of a grounding.
Moreover, a large-sized transformer is begun and low-impedance-ization is attained by the Para using of a custom-made electric-field capacitor or a high-speed rectifying device.

The newly developed quality part examined one by one is adopted focusing on parts which a music signal passes directly, such as a capacitor, a resistor, a semiconductor, and a coil, or the object for power sources.

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

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel drive
160W+160W (6ohm)
130W+130W (8ohm)
Dynamic power 405W (2ohm)
320W (4ohm)
210W (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 (8ohm)
Frequency characteristic (1W) DC-300kHz+0 -3dB
Input sensitivity/impedance 1V / 5kohm (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%):210mV
MC(THD 0.1%):21mV
Frequency characteristic Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, Tape/DAT1, 2, and 3:DC-200kHz+0 -3 dB
SN ratio Phono man month: 88dB or more
Phono MC: 70dB or more
compact disk, Tuner, Line, Tape/DAT1, 2 or 3:110dB or more
Tone control Bass: }6dB (50Hz)
Treble: }6dB (15kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness + 4dB (50Hz), +3dB (10kHz)
<Synthesis>
Power dissipation 330W
Dimensions Width 466x height 163x depth of 450mm
Weight 22.0kg