Audio Database

The pictorial image of AU-alpha 607 MOS Premium

SANSUI AU-alpha 607 MOS Premium * Limited manufactured goods
138,000yen(1991 release)

Description
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Amplifier made in commemoration of the 15th anniversary of the AU-607 to 607 series put on the market in 1976.

The pair MOS FET of 2SK405/2SJ115 which is an element which can be amplified high-speed is adopted as the power stage. The capacity of this element is demonstrated by an Advanced alpha-X balance circuitry, and high-quality sound-ization is attained.
An Advanced alpha-X balance circuitry carries exclusive amplifier in + [ of an output ], and - side, respectively. + With the balance stream composition of the push pull scheme to which a speaker is made to drive by four sets of amplifier from - bothways, the circuitry itself has canceled an exogenous noise and inphase distortion.
furthermore -- uniting with the NEW diamond differential circuit which can supply a momentary large current -- low-impedance & -- it is clean and the outstanding performance characteristic is realized.

The power transformer and electrolytic capacitor which were developed newly are adopted as a power-source part, and also a power-source part is considered as the closed-loop stream composition made to become independent and separate from a grounding completely, and the ill effect to the music signal produced from the unbalance of a power source etc. is stopped.

It places focusing on the power-source part which consists of a power transformer and an electrolytic capacitor, and a power unit is arranged symmetrically.
This has prevented effectively the failure of the tone quality by the natural oscillation of the amplifier from a power supply system and a signal system with the ideal amplifier stream composition of the weight balance.

An isorated mechanical feedback is introduced and an internal loss uses in plenty the isolation part made from a pure copper which was greatly excellent in vibrational absorption capacity.
The fixed part of a master volume etc. has eliminated an oscillation, a vibration, and a magnetic distortion thoroughly in all fractions including a power supply system and a signal system.

The part examined each quality carefully and has adopted non-magnetic-material-izing, vibration-proof-izing, low-impedance-izing, and the high-speed-ized tone-quality parts, such as a power transformer, an electrolytic capacitor, etc. of special edition, on various level.

The power amplifier direct which carries out the direct input of the high digital music signal of an output to a power amplifier part is carried.
here -- more -- high -- in order to realize purity transmit and amplification, in addition to a normal input terminal, the balance input terminal is also equipped.

It does not let any accessories functionalities pass, but all the usual line-input signals are transmitted to power amplifier as they are by one-touch, and the source power direct in which direct interconnection and amplification are possible is carried.

Even if it connects a compact disk player to a power amplifier direct, the back sound recording of other sources is possible in listening.
For example, another sources, such as compact disk, can be recorded in Normal 2, hearing the source inputted in Normal 1.

The phone equalizer which demonstrates the capacity of a MC-man month cartridge is equipped.

Eleven input terminal loading.

All gilding input terminal

6-unit Detent volume.

Aluminum shaving appearance master volume thumb

Real sub- wood.

Polar window power cord AC outlet.

AU-alpha MOS Premium Black model
The backplane of AU-alpha 607 MOS Premium
The interior of AU-alpha 607 MOS Premium The part of AU-alpha 607 MOS Premium

Rating of a mode
Form Integrated amplifier
<Power amplifier part>
Effective output (10Hz - 20kHz)
Both channel simultaneous operation
55W+55W (6ohm)
45W+45W (8ohm)
THD (at the time of an effective output) 0.008% or less (8ohm)
Cross modulation distortion 0.008% or less (8ohm)
Dumping factor 150 (8ohm)
Frequency characteristic (1W) DC-300kHz+0dB, -3dB
Input sensitivity/impedance 1V / 5kohm (1kHz)
SN ratio (A network) 120dB or more
Dynamic power 70W (6ohm)
85W (4ohm)
90W (2ohm)
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, Tape/DAT-1, 2 or 3:150mV / 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, Tape/DAT-1, 2, 3:DC-200kHz+0dB, -3dB
SN ratio (A network) Phono man month: 88dB or more
Phono MC: 70dB or more
compact disk, Tuner, Line, Tape/DAT-1, 2 or 3:110dB or more
Tone control The Bass maximum variation: }6dB (50Hz)
The Treble maximum variation: }6dB (15kHz)
Subsonic Filter 16Hz (-3dB), 6dB / oct
Loudness + 4dB (50Hz), +4dB (10kHz)
<Synthesis>
Power dissipation 160W
Dimensions Width 460x height 159x depth of 446mm
Weight 18.8kg