Audio Database

The

SANSUI AU-alpha 607MR
99,000yen(1995 release)

Description
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The Integrated Amplifier of memory-read series which adopted the New Hyper alpha-X balance circuitry.

In order to make into operation top zero an occurrence of the electrical noise generated inside a circuitry, the New Hyper alpha-X balance circuitry is adopted.
By CMRR, this circuitry developed further into the Hyper alpha-X balance circuitry the Wilson current mirror quantity CMRR type constant current circuit which realizes the with a theoretical value of 140dB modification effect, and was developed in it,It has the composition of having carried the up-and-down symmetrical balance type constant current circuit of the Advanced Wilson current mirror scheme.
It has succeeded in making the driver stage into the closed loop by another coil, and the asymmetry of the element which happens in a circuitry preparing the variation in the electric current by DC offset of a cause by this, and also raising the stability of an operation of the circuitry itself.
Moreover, the main power-source part of an output stage which concentrated the transformer, the electrolytic capacitor, etc. is also made into the closed loop by another coil, lets all the systems pass from the entry point of sound to an outlet, and is building the optimal operating environment for balance amplifier.
Furthermore, device NM-LAPT only for an audio is adopted.

Since the New diamond differential circuit is adopted as the drive stage in order to improve the responsibility to a momentary signal, and - output can be taken out without phase inversion, the current-supply-source capacity over the input signal which changes violently is high, and the outstanding property has been realized.
Furthermore, in addition to the cascade connection of FET of the first rank, the circuitry is made into a wide range and the thing which had high-speed-ized and was more excellent in the performance characteristic of New alpha-X balance amplifier by using a driver power-source part as an up-and-down symmetry and a balanced type.
Moreover, the effect of preventing a tone-quality failure also in the case of the interconnection with the external equipment which differs in an impedance is demonstrated.

The New alpha-X balance power source is adopted as a power-source part.
The output stage was made the balanced type closing, the driver stage was made into the up-and-down symmetrical balance type constant-current regulated power supply, and the ill effect to the tone quality of the imbalanced electric current of the power source leading to a tone-quality failure is prevented by having the closed-loop stream composition which carried out full independence from the grounding.
Furthermore, stable large-current supply capacity is realized by examining and adopting parts of an original development, such as a large-sized power transformer of a special structure, an electrolytic capacitor for power sources, first recovery diode.

The oscillation from a power supply system and vibration system is controlled by the strengthening twin monophonic construction and the isorated mechanical feedback.

The insulator of high-quality parts, such as a resistor of a golden plating bar and a capacitor, and the special structure which distributes and absorbs the oscillation from the outside is adopted.

By connecting with a power amplifier direct input terminal, each source passes through the inside of a circuitry according to the shortest distance, and a power amplifier part and a hardwired connection are possible.
Moreover, the source power direct functionality is carried.

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

Rear Internal
Black
Power

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel simultaneous operation
105W+105W (6ohm)
90W+90W (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 (1kHz) 1V/5kohm
SN ratio (A network) 120dB or more
Dynamic power 280W (2ohms)
220W (4ohms)
155W (6ohms)
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 ohm
compact disk, Tuner, Line, Tape/DAT1, 2:150mV / 20kohm
Phono maximum permissible input MM:210mV(THD 0.01%)
MC:21mV(THD 0.1%)
the frequency characteristic (1W) Phono man month: 20Hz-20kHz}0.2dB
compact disk, Tuner, Line, Tape/DAT1, and 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, Tape/DAT1, 2:110dB or more
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)
<Others>
Power dissipation 250W
Dimensions Width 430x height 162x depth of 452mm
Weight 18.0kg
Option Real sub- wood SW-AU4 (one set, 14,000yen)