Audio Database

The

SANSUI AU-alpha 907NRA
300,000yen(1998 release)

Description
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The Integrated Amplifier which adopted the Ultimate alpha-X balance circuitry.

By the Ultimate alpha-X balance circuitry, the current margin of the driver stage was raised twice over the past, it was considered as the first class operation, and a dynamic behavior and the formation of wide-range high speed excellent in all the transmit / amplification it1s are realized.

A final stage changes a talk stream composition into a single drive balance push pull, carries NM-LAPT of Pc(collector loss)200W suitable for the large power amplification which was being used for the power amplifier B-2302, is that the electric-current margin at the time of a real operation improves, and enables the outstanding play.

The power transformer of 13kg of total weights is adopted as a power-source part.
By enclosing a high-density fill, the oscillation at the time of an operation is pressed down and the stable supply capacity of the electric current is raised to the interior of the shielding of a quadruplicate structure.
Moreover, it has the structure where an oscillation of a power supply system does not get across to a chassis, with the mechanical floating scheme which carried out the floating of the mounting of a power transformer from the chassis.

By adopting a new model-like radiator, the occurrence of the oscillation is suppressed to the relative minimum.
Furthermore, what lessens an oscillation and a resonance for 3 splitting bonnet containing new model-like copper powder is developed newly, and also it has a very strong structure to the oscillation by making a floating mounting sub- wood embedding a pure-copper board.
The pure-copper ellipse insulator of a leather using which demonstrates the outstanding periodic-damping property is adopted as an insulator.

The alpha-X balance power source is adopted as a power-source part.
It has closed-loop composition of full independence from the grounding which made the output stage the balanced type closing, and used the first rank as the upper-limit symmetrical balance type constant current type power source, and the transformer sub- side also made another coil.

Non-magnetic-material-izing, low-impedance-izing, and the measure against vibration proof are put into practice among the part used as the point which determines a tone quality, and it is in the transmission route of a music signal,The thing of the highest level developed in the VINTAGE serieses of SANSUIs, such as a capacitor film capacitor, a resistor, etc. of a golden plating bar, is used.
Moreover, the OFC composition and the 24k hardening gilding termination made from German WBT with few signal losses for a speaker termination are adopted, and the banana plug is also supported.
Moreover, the thing of aluminum Naked shaving appearance is adopted as a volume knob.

The signal connected to three direct inputs is sent into a power amplifier part, without letting a preamplifier part pass.
Moreover, the balance input terminal is also carried.

The phone equalizer corresponding to both MC-man month cartridge is carried.

Bass-Treble is a span of }6.0dB, and a stepless tone coordination is possible.

The 6-unit Detent volume is carried.

Rear NM-LAPT23
Internal Power
An The
Block

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel simultaneous operation
190W+190W (6ohm)
160W+160W (8ohm)
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 / 10kohm (1kHz)
SN ratio (A network) 120dB or more
Dynamic power 580W (2ohm)
390W (4ohm)
310W (6ohm)
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate 200v/microsec
Rise time 0.5microsec
<Preamplifier part>
Input sensitivity/impedance
(1kHz)
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
the frequency characteristic (1W) Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, micro disk/Tape-1, Tape-2:DC - 300kHz+0 -3 dB
SN ratio (A network) Phono man month: 90dB or more
Phono MC: 75dB 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 +4dB(50Hz)
+3dB(10kHz)
<Synthesis>
Power dissipation 400W
Dimensions Width 462x height 165x depth of 448mm
Weight 33.0kg