Audio Database

The

SANSUI AU-alpha 607NRA
108,000yen(1997 release)

Description
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The Integrated Amplifier which carries a Ultimate alpha-X balance circuitry.

In the Ultimate alpha-X balance circuitry, operating environment ideal for an audio amplifier is realized in all the transmit / amplification it1s from an input to an output by raising the current margin of the driver stage twice over the past, and considering it as a first class operation. Furthermore, the NEW diamond differential circuit which can take out +-output without phase inversion is carried in the driver stage, the current-supply-source capacity over a momentary input signal to have excelled is acquired, and the occurrence of TIM distortion is suppressed.
Moreover, the NM-LAPT single push pull scheme is adopted, and the speaker is driven on the same requirements from both of positive/negative by arranging amplifier on + and - of a right-and-left channel of an output stage, respectively.

The NEW alpha-X balance power-source scheme is adopted as a power-source part.
The closed-loop stream composition of full independence is realized from the grounding by making an output stage a balanced type closing, and making the first rank into an up-and-down symmetrical balance type constant-current regulated power supply, and also making the transformer sub- side into another coil. The imbalanced electric current of the power source which has an ill effect on a tone quality by this is prevented.
Moreover, custom-made component partses, such as an electrolytic capacitor for power sources of a low scaling factor which uses the foil for high-quality sound, are adopted.

A twin monophonic construction, an isorated mechanical feedback, etc. are adopted as a chassis structure, and the cross interferencee is suppressed.
Moreover, in AU-alpha 607NRA, the floating of the installment of the power transformer which is the maximum source of an oscillation was carried out from the chassis, and the mechanical interference is eliminated by considering it as the structure where an oscillation of a power supply system is not told to a chassis.
Moreover, the ellipse-shaped insulator is adopted.

In order to suppress an oscillation of a heat sink, the radiator of the shape of a new model which suppresses an occurrence of an oscillation to a relative minimum is developed, a vibration action is distributed effectively, and the oscillation of a power supply system and the interference of the music signal are suppressed.

The power amplifier direct input functionality corresponding to compact disk and Line is carried.

The 6-unit Detent volume is adopted as a volume.

Black
Rear
Internal Power

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel simultaneous operation
100W+100W (6ohm)
80W+80W (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 250W (2ohm)
200W (4ohm)
140W (6ohm)
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate 180v/microsec
Rise time 0.6microsec
<Preamplifier part>
Input sensitivity/impedance
(1kHz)
Phono man month: 2.5mV / 47kohm
Phono MC: 300 microvolts/100 ohms
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, and Tape-2:DC-200kHz+0 -3 dB
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>
Power dissipation 220W
Dimensions Width 432x height 165x depth of 450mm
Weight 18.0kg