|SANSUI AU-alpha 707L Extra
|145,000yen(around the 1989 time)
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.
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
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
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.
|<Power amplifier part>
|Effective output (10Hz - 20kHz)
Both channel drive
|THD (at the time of an effective output)
||0.003% or less (8ohm)
|Cross modulation distortion
||0.003% or less (8ohm)
|Frequency characteristic (1W)
||1V / 5kohm (1kHz)
|SN ratio (A network)
||120dB or more
|TIM distortion (SAWTOOTH)
||Below a limit-of-measurement value
|Phono man month: 2.5mV / 47kohm
MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape/DAT1, 2 or
3:150mV / 20kohm
|Phono maximum permissible input
||Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, Tape/DAT1, 2, and 3:DC-200kHz+0 -3 dB
||Phono man month: 88dB or more
70dB or more
compact disk, Tuner, Line, Tape/DAT1, 2 or 3:110dB or more
||Bass: }6dB (50Hz)
Treble: }6dB (15kHz)
||16Hz (-3dB), 6dB / oct
||+ 4dB (50Hz), +3dB (10kHz)
||Width 466x height 163x depth of 450mm