SANSUI AU - α 907L Extra

Commentary

This is the top pre-main amplifier of the LExtra series that uses LAPT which is a transistor only for audio.

To improve linearity at low levels, it is equipped with LAPT (Linear Amplification Power Transistor) newly developed for audio only.
The LAPT is made of pure copper. By making the bonding wires nonmagnetic, the generation of magnetic distortion is eliminated. This greatly improves the cut-off frequency and broadens the band, while improving the linearity of current amplification factor and switching characteristics.

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.
The AU - α 907L Extra uses solid pure copper large insulators, LAPT absorbers, and pure copper parts such as transformer base in order to ensure no vibration and no resonance.

The power supply section has a balanced power supply structure, and various adverse effects are suppressed by making it a closed loop which is independent from ground.
In addition, newly developed large transformers filled with high-density fillers, power capacitors, fast recovery diodes, and other newly developed custom-made products are used to achieve low impedance and high speed.

We use carefully selected parts, including capacitors, resistors, semiconductors, coils and other parts that allow music signals to pass through directly.

The equalizer section is equipped with a full-scale discrete phono equalizer.

Equipped with a balanced input.

Equipped with functions such as power amplifier, direct, source direct, and REC selector.

The volume is equipped with 6 continuous detent volume.

Model Rating

Type	Α -X Balanced NM-LAPT / Amplifier
Power Amplifier Unit
Effective output (20 Hz to 20 kHz Both channel drive)	190W + 190W (6 Ω) 160W + 160W (8 Ω)
Dynamic Power	580W (2 Ω) 390W (4 Ω) 310W (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	1V/3k Ω (1 kHz)
Signal-to-noise ratio (A network)	120 dB or more
TIM (SAWTOOTH)	Measurement limit value or less
Slew rate	200 V / μ sec
Rise time	0.5 μ sec
<Pre-part>
Input Sensitivity / Impedance (1kHz)	Phono MM : 2.5mV/47k Ω Phono MC : 300 μ V/100 Ω CD, Tuner, Line, Tape/DAT1, 2, 3 : 150mV/20k Ω
Phono maximum allowable input	MM(THD 0.01%):250mV MC(THD 0.1%):25mV
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.2 dB CD, Tuner, Line, Tape/DAT1, 2, 3 : DC ~ 300 khz + 0 -3dB
Signal-to-noise ratio	Phono MM : 90 dB or more Phono MC : 75 dB or more CD, Tuner, Line, Tape/DAT1, 2, 3 : 110 dB or more
Tone control	Bass : + / - 5 dB (50 Hz) Treble : ± 5 dB (15 kHz)
Subsonic filter	16 Hz (-3dB), 6dB/oct.
Loudness	+ 4 dB (50 Hz), + 3 dB (10 kHz)
<General>
Rated power consumption	400W
External dimensions	Width 472x Height 164x Depth 450 mm
Weight	33.0kg