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| SANSUI AU-alpha 607NRAII
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| 119,000yen(1999 release) |
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The enhancement model of AU-alpha 607NRA.
In
order to eliminate the interference between the power-source coils which happen
within a transformer, EI core transformer only for a speaker drive is used for
the final stage, it carries by a right-and-left independent-source scheme, and a
toroidal transformer is carried in the power source of the predrive stage,It has
flume detour way composition which makes the powering to the final stage become
independent.
Moreover, in the predrive stage, a ripple filter circuitry is
adopted as a power source, and it has become the power source stabilized more.
A toroidal transformer is completely shielded by pure-copper material, and a
Teflon sheet and special rubber, and is attached to the rear view of the front
panel in the state of the floating.
The Ultimate alpha-X balance
circuitry original with an SANSUI is adopted.
By raising the current margin
of the driver stage twice over the past, and carrying out a first class
operation, operating environment excellent in transmit / amplification it1 in
which it results in an output from the input of the first rank, the driver
stage, and a final stage is realized.
Moreover, since a whole page is a
balance stream composition independent of a grounding circuitry and it is a push
pull scheme which puts exclusive amplifier on +-each sides of L/R, and drives a
speaker on these requirements with a total of four amplifier, balance amplifier
is,The distorted mechanism which a tone quality is not spoiled by the hum or
noise component which flow in through a grounding like the conventional grand
amplifier, and originates in a speaker drive was removed, and the tone quality
is improved.
The NEW diamond differential circuit which can take out the
output of +- without phase inversion is carried in the predrive stage.
While
having the outstanding responsibility and being able to supply the stable large
current to the input signal which changes momentarily by this, the outbreak of
the TIM distortion is suppressed very low.
NM-LAPT (non magnetic linear
amplification power transistor) is adopted as a power device.
The twin
monophonic construction which arranged each power unit of L/R for the
transformer or the electrolytic capacitor symmetrically in the center of a
chassis is adopted.
Thereby, an interference of L/R is prevented and the
oscillation generated in a power supply system and vibration system is
controlled from a structure side.
The NEW alpha-X balance power source
which evolved further by 2 transformer power circuit is adopted.
The final
stage is considered as a right-and-left independent balance type closing, and
the predrive stage is used as the balance type low electric-current power source
for the upper and lower sides, and also it has the full independence type
closed-loop stream composition which carried out the full separation of the
power source of the predrive stage and a final stage itself from the
transformer.
Furthermore, the original block capacitor which involved in a
separator and plain foil in addition to the tone-quality foil of a low scaling
factor is adopted as the electrolytic capacitor of the power-source part only
for a final stage.
A strengthening twin monophonic construction and an
isorated mechanical feedback. And the mechanical floating scheme is adopted to a
power transformer.
A transformer is attached in the status that it was
considered as the flow from the chassis, and the interference to the tone
quality by oscillation of a power supply system is intercepted structurally.
The new model-like radiator is adopted in order to suppress the
occurrence and vibration of an oscillation of a radiator to which the power
transistor is attached.
The ellipse form insulator which adopted the
special material and the structure is adopted.
The 6-unit Detent volume
is adopted as a volume.
The polar attached-indicator power cord is
adopted.
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| Form |
Integrated amplifier |
| <Power amplifier part>
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Effective output (10Hz - 20kHz)
Both channel simultaneous operation |
100W+100W (6ohm)
80W+80W (8ohm) |
| THD (at the time of an effective output)
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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 / 10kohm (1kHz) |
| SN ratio (A network) |
120dB or more |
| Dynamic power |
310W (2ohm)
210W (4ohm)
150W (6ohm) |
| TIM distortion (SAWTOOTH) |
Below a limit-of-measurement value
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| Slew rate |
150v/microsec |
| Rise time |
0.6microsec |
| <Preamplifier part>
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Input sensitivity/impedance
(1kHz)
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Phono man month: 2.5mV / 47kohm
Phono MC: 300 microvolts/100 ohm
compact disk, Tuner, Line, micro disk/Tape1,
Tape2:150mV/20kohm |
| Phono maximum permissible input |
MM(THD 0.01%):210mV
MC(THD 0.1%):21mV
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| the frequency characteristic (1W)
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Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, micro disk/Tape-1, Tape-2:DC - 300kHz+0 -3 dB
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| SN ratio (A network) |
Phono man month: 88dB or more
Phono MC:
70dB or more
compact disk, Tuner, Line, micro disk/Tape-1, and more than
Tape2:110dB |
| Tone control |
The Bass maximum variation: }6dB (50Hz)
The Treble maximum variation: }6dB (15kHz) |
| Subsonic Filter |
16Hz (-3dB), 6dB / oct |
| Loudness |
+6dB(50Hz)
+4dB(10kHz) |
| <Synthesis>
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| Power dissipation |
230W |
| Dimensions |
Width 432x height 165x depth of 450mm
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| Weight |
19.0kg |
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