Audio Database


SANSUI AU-alpha 607Extra
85,000yen(around the 1988 time)

The Integrated Amplifier which adopted the alpha-X balance circuit and the NEW diamond differential circuit.

The alpha-X balance circuit is adopted and the noise has adopted as circuitry the balance amplification scheme canceled inevitably. This has the usual amplifying circuit and a difference in the place which is not based on a grounding not only for an amplification of a signal but for a supplying of a power source.
Furthermore, in AU-alpha 607Extra, the further quality up is aimed at by attaining low-impedance-ization of the whole circuitry with adoption of a NEW diamond differential circuit.
Moreover, not the scheme that also drives a speaker drive between an amplifier output like before and a grounding but the double push pull scheme which also drives + side of a speaker to the - side and a peer-to-peer from bothways is adopted, and this supports the impedance variation and the phase change.

The NEW diamond differential circuit which made cascade connection FET adopted as the first rank is adopted.
This has reduced the influence on the tone quality from a connection assembly by the difference in the Output load impedance at the time of a power amplifier direct etc.

The balance power source original with an SANSUI which was made to become independent of a grounding and was made into the closed loop is adopted as a power-source part.
+ Since the electric current is always equal by the side and - side, the ill effect to the music signal produced from the unbalance of a power source has been canceled.
Moreover, the custom-made electrolytic capacitor developed in a large-sized power transformer or audios is adopted as the part currently used.

The twin monophonic construction is adopted as the structure of amplifier.
This places a power-source part in the center, is what dissociated symmetrically and has arranged the power amplifier part mounted on the large-sized heat sinker, and supports the oscillation of the crosstalk and power supply system which are generated from the difference in the signal level in a L/R inter-unit, and the interference of a music signal with the acquisition of sense of stability.

The power amplifier direct switchpoint is carried and two normal inputs are carried.

Original scheme" direct-access rotary switch" which performs the source selection of an input system by a backplane termination inner side is adopted. The contact part of a rotary switch plates with gold, and is pursuing the high quality.

It is possible to reproduce without carrying the Source-Direct switchpoint and passing attached circuitries, such as a balance volume, a muting, and a Subsonic Filter.


Rating of a mode
Form Alpha-X balanced integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz, both channel drive) 6ohm: 105W+105W
8ohm: 90W+90W
THD (at the time of an effective output) 0.003% or less (8ohm)
Frequency characteristic (1W) DC-300kHz and +0 -3dB
Cross modulation distortion 0.003% or less (8ohm)
Dumping factor 150 (8ohm)
Input sensitivity 1V(Normal)
SN ratio (A network) 120dB or more
TIM distortion (SAWTOOTH) Below a limit-of-measurement value
Slew rate }180v/microsec
Rise time 0.6microsec
<Pre part>
Input sensitivity/impedance (1kHz) Phono man month: 2.5mV / 47kohm
Phono MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape Play1-2-3:150mV /, 20kohm
Phono maximum permissible input MM(THD 0.01%):210mV
MC(THD 0.1%):21mV
Frequency characteristic Phono man month: 20Hz - 20000Hz, }0.2dB
compact disk, Line:DC-300kHz, and +0 -3 dB
Tape Play-1, 2, and 3:1Hz-300kHz+0 -3 dB
SN ratio Phono man month: 88dB or more
Phono MC: 70dB or more
compact disk, Tuner, Line, Tape Play-1, 2-3:110dB or more
The tone control maximum variation BASS: }6dB (50Hz)
TREBLE: }6dB (15kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness 50Hz:+8dB
Audio muting -20dB
Power dissipation (Electrical Appliance and Material Control Law) 250W
Dimensions Width 430x height 160x depth of 450mm
Weight 18.0kg