SANSUI AU-D9 - Super Feedforward Amplifier

SANSUIS AU-D9 Amplifier

Marketed: 1981-1983
See Le Haut Parleur magazine, December 1981, No. 1675
Its price in 1981: 4500 Francs (for reference, the minimum wage in 1981 was 2825 Francs)

Included with:
A recreated user manual, as the original "Owner's Instructions" are unavailable. (See photos)
The advertising brochure in English. (See photos)

This amplifier has been restored and reconditioned by Wertronic.
The unit was disassembled and thoroughly cleaned. The switches and potentiometers were opened, if necessary, and cleaned with specific products.
65 electrolytic capacitors were replaced with Nichicon audio-grade capacitors.

The top panel was refinished in rosewood, then stained and varnished.

SUPER FEEDFORWARD SYSTEM
Super Feedforward amplifiers are Sansui's revolutionary development (in 1981) that put an end to the distortion debate once and for all.
The DC design and Sansui's exclusive DD/DC circuitry.
These developments improved transient response so dramatically that TIM and envelope distortion were virtually eliminated.
Total harmonic distortion: Less than 0.005% at or below rated minimum RMS power output.
The AU-D9 amplifier's 95 watts RMS power output into 8 ohms is accurate; it is actually closer to 100 watts.

Its large, dual-output transformer (one for each channel), along with four 12,000 μF capacitors,
prevents the power supply from collapsing, even with a 4-ohm load.

The AU-D9 weighs 14 kg!

This amplifier has incredible "sound," tight but not overpowering bass, and detailed, airy treble that's easy on the ears.

In short, IT'S SANSUI!

SPECIFICATIONS:

Power output :
Min RMS both channels driven, from 10 to 20,000 Hz
with no more then 0.005% total harmonic distortion: 95Watts per channel into 8 Ohms
Total harmonic distortion: Less than 0.005% at or below rated min RMS power output

Intermodulation distortion :
(60Hz – 7kHz = 4:1 SMPTE method): Less than 0.005% at rated power output

Frequency response (at 1Watt) :
Overall (from AUX): DC to 300,000 Hz +0dB -3.0 dB

RIAA curve deviation :
(MM phono 20 Hz to 20 kHz): +0.2 dB -0.2 dB

Rise time: 0.8 µsec
Slew rate: ±200 V/µsec

Damping factor ( 1kHz both channels driven):
150 into 8 Ohms

Input sensitivity and impedance (At 1kHz)
PHONO 1, 2 (MC): HIGH 100 µV / LOW 250 µV 
100 Ohms

Max input capability:
20mV at 1kHz, less than 0.01% total harmonic distortion
PHONO 1, 2 (MM): 2.5mV / 47 kilohms

Max input capability:
200mV at 1kHz, less than 0.01% total harmonic distortion

AUX, TUNER, TAPE PLAY 1 – 2: 250mV / 27 kilohms

Output level and impedance (1000Hz):
TAPE REC 1, 2: 250mV into 47 kilohms
600 ohms

Chanel separation (1 kHz at rated power output):
PHONO 1, 2 (MC): 50dB
PHONO 1, 2 (MM): 60dB
AUX, TUNER, TAPE PLAY 1, 2: 80dB

Signal to noise ratio (short-circuit A network) :
PHONO 1, 2 (MC): 74dB
PHONO 1, 2 (MM): 90dB
AUX, TUNER, TAPE PLAY 1, 2: 110dB

Controls

BASS: +8dB -8dB
Tone selector: 150Hz, 300Hz

TREBLE: +8dB -8dB
Tone selector: 3 kHz, 6 kHz

FILTER
16 Hz -3dB at 16Hz (6dB/oct)
20kHz -3dB at 20kHz (6dB/oct)

MUTING: -20dB

Power requirement: 100, 120, 220, 240 V (50/60Hz)

Rated consumption: 520Watts 650VA