|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.
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.
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
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.
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.
||Alpha-X balanced integrated amplifier
|<Power amplifier part>
|Effective output (10Hz - 20kHz, both channel drive)
|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)
|SN ratio (A network)
||120dB or more
|TIM distortion (SAWTOOTH)
||Below a limit-of-measurement value
|Input sensitivity/impedance (1kHz)
||Phono man month: 2.5mV / 47kohm
MC: 300 microvolts/100 ohms
compact disk, Tuner, Line, Tape Play1-2-3:150mV
|Phono maximum permissible input
||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
||Phono man month: 88dB or more
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)
||16Hz (-3dB), 6dB / oct
|Power dissipation (Electrical Appliance and
Material Control Law)
||Width 430x height 160x depth of 450mm