SANSUI AU - α 607L Extra

Commentary

A pre-main amplifier based on AU - α 607 Extra and adopting LAPT which is an audio-only transistor.

In order to improve linearity at the low level, we focused on the transistor used in the power stage and adopted LAPT (Linear Amplification Power Transistor) newly developed exclusively for audio.
The LAPT uses pure copper material instead of conventional plating material, and is completely non-magnetic up to the bonding wire. It is a part specialized for sound quality that is different from the conventional popular type from the production process.
This eliminates the generation of magnetic distortion, and by improving the internal structure of the element, the cut-off frequency is improved to 50-60 MHz, three times that of the conventional product.

A -X balanced circuit is used for the circuit structure, and a NEW diamond differential circuit with cascade connection of first stage FETs provides excellent high-frequency characteristics.

The power supply section is placed in the center and the power amplifier section mounted on a large heat sinker is arranged symmetrically in a twin monaural construction. This eliminates interference from vibration sources that adversely affect sound quality, and achieves excellent sound localization.
In addition, the concept of non-vibration and non-resonance is thoroughly applied to the details, and vibration isolation parts made of pure copper are used.

Equipped with power amplifier and direct function of two normal input lines.
Since the output level of a CD player is high, it can be directly fed to the power amplifier to bring out the digital taste.

It is equipped with functions such as source direct and REC selector.

The volume is equipped with 6 continuous detent volume.

There was a real side wood sold separately.

Model Rating

Type	Integrated amplifier
Power Amplifier Unit
Effective power (10 Hz to 20 kHz, both channel drive)	105W + 105W (6 Ω) 90W + 90W (8 Ω)
Dynamic Power	280W (2 Ω) 220W (4 Ω) 155W (6 Ω)
Total harmonic distortion factor (at effective output)	0.003% or Less (8 Ω)
Cross modulation distortion factor	0.003% or Less (8 Ω)
Damping factor	150 (8 Ω)
Frequency Response (1W)	DC ~ 300 khz + 0 -3dB
Input Sensitivity / Impedance (1 kHz)	1V/5k Ω
Signal-to-noise ratio (A network)	120 dB or more
TIM (SAWTOOTH)	Measurement limit value or less
Slew rate	180 V / μ sec
Rise time	0.6 μ sec
<Pre-part>
Input Sensitivity / Impedance (1 kHz)	Phono MM : 2.5mV/47k Ω Phono MC : 390 μ V/100 Ω CD, Tuner, Line, Tape/DAT1, 2, 3 : 150mV/20k Ω
Phono maximum allowable input	MM(THD 0.01%):210mV MC(THD 0.1%):21mV
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.2 dB CD, Tuner, Line, Tape/DAT1, 2, 3 : DC ~ 200 khz + 0 -3dB
Signal-to-noise ratio	Phono MM : 88 dB or more Phono MC : 70 dB or more CD, Tuner, Line, Tape/DAT1, 2, 3 : 110 dB or more
Tone control	Bass : ± 6 dB (50 Hz) Treble : ± 6 dB (15 kHz)
Subsonic filter	16 Hz (-3dB), 6dB/oct.
Loudness	+ 6 dB (50 Hz), + 4 dB (10 kHz)
<General>
Rated power consumption	250W
External dimensions	Width 430x Height 160x Depth 450 mm
Weight	18.0kg
Sold Separately	Real Side Wood SW-AU1 (¥ 10,000)