Audio Database

The

SANSUI AU-D907Limited
175,000yen(1979 release)

Description
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The custom-made model which threw in many know-hows which removed all restraints, and pursued thoroughly from sound and technical double-sideds based on AU-D907, and also were cultivated by the development of AU-X1, and new materials.

The 20 same stone stream compositions as AU-X1 are adopted as an equalizer circuitry.
The cascode bootstrap circuitry and interval which bring a diamond differential circuit close to an ideal operation much more have realized the expansion of a dynamic range.
Moreover, MC head amplifier adopts an all FET input and a full push pull input/output circuitry, and Pch/Nch FET is used for an element.

The linear high-speed element LAPT of a non-iron structure (Linear Amp.Power Tr.) is adopted by 2 parallel connection, and the real value of a diamond differential circuit is raised more.
This realizes high response speed of inside slew-rate}300v/microsec, and the occurrence of TIM distortion is suppressed to near the zero.

The power-source part is strengthened on the theme of the high-speed response, it changed into the power-source scheme in the conventional voltage stabilizer, and the complimentary push pull (shunt) regurated circuitry is newly adopted. This circuitry guarantees the voltage supplying stabilized not only at the time of voltage descent but at the time of a power surge, and enables the power feeding stabilized more.
Moreover, in quest of the high-grade play, the case of the pure oval capacitor and the coupling capacitor was changed into the case made of a resin from aluminum, and also first recovery diode is adopted as all the diodes for a rectification.
And in order to heighten the effect of a pure oval capacitor further, the 1.2mm thickness brass board advantageous to the chassis of a power-source part in respect of a tone quality is adopted.
Moreover, the large-sized toroidal transformer and the large-sized EI transformer were adopted as the power transformer, and the power cord with the current capacity of 15A for 200W amplifier classes is adopted as a power cord.

A pure copper is plated on a rear panel and a chassis, and also the brass board is used for the power-source part chassis, and a mounting screw also performs a bronze treatment and is aiming at the fall of the grounding RF impedance.
Moreover, the ebony wood case of the Eve Knee finish is adopted from making flavor on exclusion and the design of the stray current.

DC amplifier stream composition using the full push pull drive circuitry of the all FET input is adopted.
Moreover, 10 stone stream-compositions DC amplifier is adopted also as a flat / tone amplifier.

The direct SP output-terminal is carried and A system is direct connected with DC power amplifier stage by the shortest distance not passing through a changeover switch.

The tone jump switchpoint is carried and it can link with a power part directly from an equalizer.

The DC-AC main-amplifier input is carried and an independent using of a pre part and a power part is possible.

The large-sized and positive screw lump type is adopted as a speaker termination.

Rear
Internal A
Non-iron Power-source
Equalizer
The

Rating of a mode
Form Wide-range DC Integrated Amplifier
<Power amplifier part>
Effective output 100W+100W (8 ohms, 10Hz - 20kHz, THD 0.008%)
100W+100W (8 ohms, 1kHz, THD 0.003%)
THD 0.008% or less (at 10Hz - 20kHz, the time of an effective output 8ohms)
Cross modulation distortion (60Hz:7kHz=4:1) 0.008% or less
Output bandwidth 3Hz - 70kHz (IHF, both ch(es) operation, THD0.02%, 8ohms)
Dumping factor 100 (IHF, both ch(es) operation, 1kHz, 8ohms)
Frequency characteristic (1W) DC-500kHz+0 -3dB
Input sensitivity/impedance (1kHz) 1V/47kohm
SN ratio 125dB or more (IHF, A network, a short circuit)
Channel separation 95dB or more (IHF, 1kHz)
Rise time 0.5microsec
Slew rate (8ohms) }200v/microsec
Inside slew rate (8ohms) }300v/microsec
TIM distortion (the SAWTOOTH method, 8ohms) 0.001% or less (LPF, 100kHz)
Envelope distortion (8ohms) 0.001% or less
<Preamplifier part>
Input sensitivity/impedance (1kHz) Phono-1 man-month:2.5mV /, 47kohm
Phono-1 MC: 0.1mV/ten ohms
Phono-2 man-month:2.5mV /, 47kohm
AUX, Tuner, Tape Play 1, 2:150mV / 30kohm
MC conformity impedance 100ohms or less
Phono maximum permissible input (1kHz) Phono MM(THD 0.01%):350mV
Phono MC(THD 0.03%):30mV
Output voltage (1kHz) Tape Rec 1, 2 (PIN):150mV (at the time of 47kohm)
Pre Out: 1V (at the time of 47kohm)
Max Pre Out(THD 0.05%): 4V (at the time of 47kohm)
Output load impedance (1kHz) Tape Rec 1, 2:600ohms or less
THD Phono MC (1kHz, 6V): 0.005% or less
Phono man month (20Hz - 20kHz, 6V): 0.005% or less
AUX, Tuner, Tape Play 1, 2 (20Hz - 20kHz, 1V):0.005% or less
Cross modulation distortion (60Hz:7kHz=4:1) AUX, Tuner, Tape Play 1, 2 (1V):0.005% or less
Frequency characteristic RIAA deflection (Phono 1, 2 or 20Hz - 20kHz): }0.2dB
AUX, Tuner, Tape Play 1, 2:5Hz - 100kHz, and +0 -1 dB
SN ratio (IHF, A network)
Short circuit
Phono MC(input conversion): -154dBV
Phono man month: 90dB or more
AUX, Tuner, Tape Play 1, 2:100dB or more
Channel separation
(IHF, 1kHz)
Phono MC: 70dB or more
Phono man month: 75dB or more
AUX, Tuner, Tape Play 1, 2:80dB or more
The separation between inputs
(Input short-circuit, 1kHz)
Tuner<=>Phono man month: More than 90dB
Tape Play 1, 2 <=>Phono man month: 90dB or more
Tuner<=>Tape Play 1, 2:90dB or more
More than Tape Play 1 <=>Tape Play 2:100dB
Tone control Bass: }6dB (50Hz)
Tone selector (turnover frequency): 300Hz, 150Hz
Treble: }6dB (15kHz)
Tone selector (turnover frequency): 6kHz, 3kHz
Subsonic Filter 16Hz (-3dB, 6 dB/oct)
Audio muting -20dB
Headphone jack output 120mW (8ohms)
<Synthesis>
Load impedance 4-16ohm
Power dissipation (Electrical Appliance and Material Control Law) 260W
Dimensions Width 466x height 182x depth of 432mm
Weight 20.0kg