
SANSUI B-2103 MOS VINTAGE
|
|
360,000yen(1992 release) |
A MOS FET element is adopted, and it is designed
harness the capacity, and is stereo power amplifier.
The alpha-X balance
circuitry which performs the balance operation which was consistent from the
input of the source to the drive of a speaker is carried.
An output stage is
made into the push pull scheme of Power MOS FET, and it is a speaker on either
side + - It is driving on the same requirements with a total of four amplifier
with which both were equipped.
the inphase distortion of a reverse
electromotive style or an exogenous noise which realized the perfect separation
of the amplifying circuit of amplifier, and a grounding circuitry by this, and
the circuitry itself generated with the speaker -- a principle -- it has shut
out to the law.
Furthermore, the original balance feedback stream
composition which crosses from the - side output to the + side input is adopted
as NFB from the + side output to the - side input, and wide-range-ization is
attained.
As an output element of a power stage, Power MOS FET and the
pair of 2SK405/2SJ115 are used.
Since the store-recording effect does not
occur, this element is excellent in a linearity and enables the stable
high-speed amplification.
Moreover, the silence in minute level is also high
and the Advanced alpha-X balance circuitry and power-source part which were made
into the low distortion and the low-impedance are drawing out the original tone
quality of MOS FET.
In order to correspond to dynamic ranges, such as
the digital source, the input was made into the cascade connection of FET and
the NEW diamond differential circuit which can take out the output by the side
of - without phase inversion on a power stage is adopted.
In accordance with
a driver power source, the outstanding linearity, and large-current supply
capacity and a high-speed responsibility are demonstrated, and the loss of the
sound by occurrence of TIM distortion is suppressed.
In order to operate
the MOS FET amplifier which needs the stable large current to the maximum
extent, the power-source part of all the stage independent power feedings is
carried.
The vibration suppression structure and the transformer of low
leakage which carried out the original development were begun to the B-2103
special purpose, and the electric current which pursued low-impedance-izing and
high speed-ization and was stabilized with highly efficient electrolytic
capacitor and first recovery diode etc. is acquired.
Moreover, each stage
was made into the independent source, and the final power source adopted the
balance stream composition of the closed loop system made to separate from a
grounding circuitry, and has prevented the tone-quality failure by the natural
oscillation and noise of the unbalance of a power source, or a power-source
part.
In order to eliminate the influence of an oscillation of the
power-source part acting as the out-of-order of stereophonic reproduction, or a
signal system, the twin monophonic construction which places a power-source part
in the center of amplifier, and arranges a power unit symmetrically is adopted.
The image orientation and the phase response are improved by controlling an
occurrence and propagation of an oscillation of a power transformer and a
capacitor by the optimal weight balance of the structure, and also realizing
shortest-ization of a circuitry by it.
In order to control a natural
oscillation and a visitor oscillation of amplifier further, the isorated
mechanical feedback is introduced.
For example, it is crowded with a
pure-copper board on both sides of MOS FET, and pure-copper material is used
also for each part, such as a transformer, a sole plate, an insulator.
Moreover, between the sole plate and the insulator, an isolated rate is
carried out with a Teflon sheet, a propagation of an oscillation is intercepted, and the purity of the music signal is protected.
A gilding treatment,
non-magnetic-material-izing, low-impedance-izing, high-speed-izing, the measure against vibration proof, etc. are put into practice among the part used as the
point which determines a tone quality.
The impedance has adopted as a connector part the RCA gilding connector made from WBT which was low excellent also in the corrosion resistant, and the Neutrik gilding balance input terminal.
Moreover, parts, such as a gilding resistor (RMG) metallurgy plating film capacitor (GUG), an OFC lead capacitor, and the SILMIC electrolytic capacitor, are adopted.
In consideration of vibration proof, it is
used for it, carrying out hand tooling of the aluminum board of 6mm thickness to
the front panel which is a face of amplifier.
Furthermore, it has a stable
structure by the side panel which carried out the interior of the 8mm thickness
felt which absorbs unnecessary reflective sound, and the chassis which also made
the top plate the product made from aluminum.
Moreover, the sole plate was
made into the product made from a pure copper, and the W bottom of a copper
plating chassis, and it has equipped with the large-sized insulator of the newly
developed Naked made from an ellipse pure copper that uses a Teflon sheet and
felt.
While using the internal loss which a pure copper has, the variance of
the resonance was considered as the oscillation and the internal interference and the extraneous vibration are eliminated thoroughly.
|
|
|
|
.JPG) |
Form |
Stereo power amplifier |
Effective output (10Hz - 20kHz, both channel simultaneous operation) |
150W+150W (6ohms)
110W+110W (8ohms)
|
THD (at the time of an effective output)
|
0.008% (8ohms) |
Cross modulation distortion |
0.008% (8ohms) |
Dumping factor |
200 (8ohms) |
Frequency characteristic (1W) |
DC-300kHz and +0 -3dB |
Input sensitivity/input impedance (1kHz)
|
1V/10kohm |
SN ratio (A network) |
110dB or more |
Dynamic power |
190W (6ohms)
240W (4ohms)
320W
(2ohms) |
エンベ lobe distortion |
Below a limit of measurement
|
TIM distortion (SWATOOTH) |
Below a limit of measurement
|
Slew rate |
150v/microsec |
Rise time |
0.5microsec |
Channel separation (1kHz) |
90dB or more |
Subsonic Filter |
10Hz (-3dB), 6dB / oct |
Load impedance |
4ohm-16ohm |
Power source |
AC100V, 50Hz/60Hz |
Power dissipation |
350W |
Dimensions |
Width 450x height 173x depth of 477mm
|
Weight |
35.0kg |
|
|
|