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Sansui AU-999

Solid State Integrated Stereo Amplifier

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Sansui AU-999

Description

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.

Specifications

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

Weight: 38.5lbs

Downloads

service manual  English

schematic  English - Nucciopan

schematic (imp scan)  English - computerwala

AN-044 service bulletin  English - Ivy Caudieus

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Reviews

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rating
Submitted by jalocha

no comment

rating
Submitted by bernard.de.torres

Très bon ampli

 

Comments

Service Manual

Service manual has no schematics. 8002 UFO transistors sub to 2SC1815, 9002 UFO subs to 2SA1015 and XA495C037 subs to 2SA970 (A 120v .1A with Hfe of around 500) in the amp preamp/driver stage. These subs are tested and work GREAT! Can someone supply schematics?

Original and modern transistor subs for AU-999

Here are the original "flying soccer" transistor replacements used by Sansui, followed by modern subs of even better quality as suggested by Kev on AK:

XA495: 2SA640 or ZTX795 from Mouser
TR823 (small boards under chassis and heat sinks): 2SC875E or KSC2690AYS from Mouser
TR813 (driver boards): 2SA532E or KSA1220AYS from Mouser
TR811, TR807, TR805 (driver boards): 2SC875E or KSC2690AYS from Mouser
D801 and D803 should be replaced by 1N4148.
Finally, remove the subsonic filters and update both F-1209 preamp boards with Kev's update. Your 999 will sound MUCH better and will no longer clip even at full power. This only requires updating four resistors.

This website is not affiliated with or sponsored by Sansui. To purchase AU-999 spares or accessories, please contact the company via their website or visit an authorised retailer.