|SANSUI AU-alpha 907Limited
||* 2000-set limited production
The Integrated Amplifier of the 3rd generation of
the Limited which deviated to neither the circuitry nor the organization nor the
part, but elaborated all, and was made.
The HYPER alpha-X balance
circuitry of the whole page wide-range DC amplifier stream composition which
made the alpha-X balance amplifier technology original with an SANSUI
concentrate by higher-order origin is carried.
In order to stop the dynamic
noise in a circuitry to the minimum, the Wilson current mirror quantity CMRR
type constant current circuit was included in the first rank of power amplifier
and a preamplifier, and the with a theoretical value of 140dB modification
effect is realized by CMRR.
Moreover, MOS FET (2SK405/2SJ115) of the old
model is chosen as an amplification element.
In C-2302 VINTAGE which is
a highest-end model of that time of an SANSUI, it was used for the power
amplifier part, and the Teflon substrate the high tone-quality modification
effect was proved to be is adopted as it for the first time by the pre-main.
electromagnetic waves fly according to the property that the dielectric
constant and dielectric dissipation factor of Teflon are very small -- etc. --
the ill effect to the passage signal in a circuitry is canceled.
vibrational absorption capacity by an internal loss was used, and the
interference to the tone quality by the oscillation in a circuitry is also
The closed-loop stream composition made to become independent
of a grounding is used for a power-source part so that it may be stabilized and
a large current can be supplied.
Each stages, such as a power stage and a
voltage amplification stage, were separated completely, and the cross
interferencee is prevented.
Moreover, since a power transformer puts low
leakage flux-ization into practice, it enclosed the high-density fill with the
interior by having made the shielding case into the quadruplicate structure, and
has realized enlargement of 13kg of total weights. 1 following and the sub- have adopted as a drawer lead the OFC lead which thought the tone quality as
Furthermore, an electrolytic capacitor is also developed newly
and it has become a thing of custom-made ellipse form.
was not blindly held down with a heavy chassis, but the strengthening twin
monophonic construction which maintained the optimal weight balance of the set
is adopted as the basis of the concept of realizing the case design taken into
the numeration to the property of an oscillation.
The interference of the
natural oscillation generated by the power supply system and a signal system is
negated according to the effect of the layout.
An original isolation
theory which utilized Teflon material and pure-copper material is established as
a measure against various oscillations generated by the electric, mechanical
operation, etc., and the tone transition generated from the physical properties
of a material.
Based on this, each fraction or part which constitute amplifier are not caught separately, but the occurrence and the propagation of
the oscillation are intercepted and controlled in total from the viewpoint to
which all were made to link.
In the insulator, in order to absorb the
interior and a foreign unnecessary oscillation effectively, pure-copper material
with the outstanding damping characteristics was cut, the gilding treatment was
carried out, and it has adopted.
Furthermore, a Teflon sheet is inserted
between pure-copper sole plates, and a stability and vibration suppression
nature are raised much more, such as sticking felt on a setting fraction.
Moreover, the aluminum bonnet of the 6mm thickness which gave the coating
containing copper powder was fixed on Teflon material and a gilding screw, and
the rigidity of a case is strengthened.
He examines the part for tone
qualities synthetically, repeating viewing and listening so that an unnecessary
colorlation may not be added, and all likelihoods of preventing an occurrence of
distortion, a noise, and a loss, such as using a high purity 6N copper belt for
a power-source part, are examined.
The OFC composition and the 24k
hardening gilding termination made from German WBT which is proud of
elaborateness with a cutting precision of 2/100mm or less are adopted as
connection to a speaker.
A banana plug or not only a very-thick speaker
cable but the bi-wiring interconnection is supported.
such as a power amplifier direct, a source power direct, a phone equalizer (MC,
man month), and an REC serector, were carried, and ten gilding input terminals
|<Power amplifier part>
|Effective output (10Hz - 20kHz)
Both channel simultaneous operation
|THD (at the time of an effective output)
||0.01% or less (8ohms)
|Frequency characteristic (1W)
||DC-300kHz and +0 -3dB
|Cross modulation distortion
||0.01% or less (8ohms)
||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, 1-2:150mV of Tape/DAT
|Phono maximum permissible input
|the frequency characteristic (1W)
||Phono man month: 20Hz - 20kHz, ±0.2dB
compact disk, Tuner, Line, Tape/DAT-1 and 2:DC-300Hz, and +0 -3 dB
|SN ratio (A network)
||Phono man month: 90dB or more
75dB or more
compact disk, Tuner, Line, Tape/DAT-1, 2:110dB or more
||16Hz (-3dB), 6dB / oct
||Width 466x height 166x depth of 453mm