Audio Database

The

SANSUI AU-alpha 507NRA
93,000yen(1998 release)

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

The Ultimate alpha-X balance circuitry has realized operating environment which is transmit / amplification it1 in which it results in an output from the input of the first rank, the driver stage, and a final stage, and was excellent by raising the current margin of the driver stage twice over the past, and carrying out a first class operation.

The NEW diamond differential circuit which can take out the output of +- without phase inversion is adopted as the driver stage. It has the current-supply-source capacity to have excelled also to the momentary input signal by this, and the occurrence of a harmful TIM distortion is suppressed on Hearing impression.

The NM-LAPT single push pull scheme is adopted. This scheme has right and left of an output stage, and 4 amplifier composition which carries exclusive amplifier in plus or minus, and is driving the speaker on the same requirements from both the positive and the negative.

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.

The new model-like radiator is adopted in order to suppress an occurrence of an oscillation to a relative minimum.

By adopting the insulator of an ellipse form, the oscillation is distributed effectively.

The polar attached-indicator power cord is adopted.

Rear Dual-unit
Internal Power
Block

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel simultaneous operation
80W+80W (6ohm)
60W+60W (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
SN ratio (A network) 120dB or more
Dynamic power 280W (2ohm)
180W (4ohm)
130W (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, Tape-2:DC - 300kHz+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 +8dB(50Hz)
+4dB(10kHz)
<Synthesis>
Power dissipation 160W
Dimensions Width 432x height 165x depth of 450mm
Weight 15.5kg