Audio Database

The

SANSUI AU-alpha 607NRAII
119,000yen(1999 release)

Description
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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.

Rear
Internal Power
Custom-made The Ellipse High-quality
Block

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 310W (2ohm)
210W (4ohm)
150W (6ohm)
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate 150v/microsec
Rise time 0.6microsec
<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: 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 230W
Dimensions Width 432x height 165x depth of 450mm
Weight 19.0kg