Solid State Integrated Stereo Amplifier (1970-72)
The AU-999 is the most advanced professional control amplifier ever manufactured by Sansui.
Designed specifically for the ardent audiophile, it features the refined dull black panels common to all AU series professional control amplifiers from Sansui.
The pre-amplifier section is constructed of carefully selected low-noise PNP silicon transistors, while the power amplifier section features direct-coupled circuits specially developed with the improvement of tonal quality in mind.
Together, they permit the AU-999 to deliver a full 180 watts (4 ohms) in music power output with unprecedented tone quality.
The AU-999 is lavishly endowed with accessory circuits.
These include a tone selector circuit, an improved form of the triple tone control circuit that offers a choice in selecting the critical frequencies of tone control; a speaker selector which permits connecting three sets of speaker systems; a balance check switch which simplifies the job of adjusting for optimum balance of the right and left channel sound volumes; facilities to connect two phonographs and two tape decks, and a tape reprint circuit.
Special provisions have also been made to permit the amplifier to be built up into an electronic crossover stereo system and permit comparing such a system with a standard stereo set-up.
Power output: 50 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 70kHz
Total harmonic distortion: 0.4%
Damping factor: 45
Input sensitivity: 3mV (mic), 2mV (MM), 200mV (DIN), 200mV (line)
Signal to noise ratio: 80dB (mic), 80dB (MM), 85dB (line)
Output: 200mV (line), 30mV (DIN)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 41 x transistors, 16 x diodes, 2 x triac
Dimensions: 18-1/8 x 6-1/8 x 12-1/2 inches
If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.
If you have additional documentation please consider donating a copy to our free archive.
Reviewed Mar 16th, 2017 by tutor turtle
I restore vintage hifi. I have restored several AU9500's. One constant problem with this model were the pre-amp transistors would get corrosion on the leads that compromised the devices hermetic seal, causing noise in the extreme i.e. going nova. Has anyone had this issue with this model? I don't want to change semiconductors unnecessarily.
Reviewed Oct 31st, 2016 by wpettit
I've owned one for over 40 years and use it with my Acoustats.
Reviewed Apr 15th, 2015 by mistergsf
I was lucky enough to get a very clean AU-999 on eBay which I've just received back from Jim at QRX Restore for recapping. I still cannot get over how amazing this amp sounds now that it's been restored. My records sound better, my speakers have additional punch and definition with better clarity. This is now my prized vintage audio possession.
Reviewed Mar 20th, 2015 by douglaslmitchell
I have always loved Sansui anything but I didn't think I could love any Sansui amp more than the AU-9900. I just bought a AU-999 and I can not put my finger on it but for some reason I do love it more than the AU-9900...