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Sansui AU-G99X

Stereo Integrated Amplifier (1986)

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Sansui AU-G99X


Power output: 160 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.003%

Input sensitivity: 0.25mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 70dB (MC), 88dB (MM), 110dB (line)

Output: 150mV (line)

Speaker load impedance: 8Ω (minimum)

Dimensions: 430 x 160 x 430mm

Weight: 17.3kg


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Reviewed Dec 04th, 2018 by luappdcl

The Sansui AU-G99x is a very clean sounding amplifier with power (160 WPC) to spare. I love the bar VU power meters and front / rear panel layouts. also the speaker switch select-able 4,8,16 speaker impedance. The speaker binding posts could have been more robust where they used a 3mm screw in terminal. the are easily sheared off. The AC power option 120/220 is also a nice feature. All-in-all a very nice unit from the late 1980's . These rare units are now becoming hard to find, grab one if you have the chance!

Reviewed May 20th, 2018 by Michael Hastie

I have owned my 99x since 1985. It has served my musical needs for 33 years and is still working well. The only issue I have had is an output transistor failing fourteen years ago and a plastic speaker terminal/cap for A.speakers 6 months ago. Cap and threaded metal post that attaches to the amp broke off. Using speakers B. The left channel output transistor was replaced with a Sansui part and has worked since.

Reviewed Jan 18th, 2016 by Bronxman

Powerfull amp with clean sound (clean is really the best word to describe it). Overall good quality. Nice digital volume meters. If your planning to buy one: watch out for left/right precision of the meters, it may be not accurate even if the actual sound is balanced properly. Of course its repairable, but it may take some time for the technician.
I use this amp every day and I have nothing to complain about.

Reviewed Jul 29th, 2015 by joel a. b.

I love this amp. Very clean sound. I bought mine in 1988 and it's still doing great!

Reviewed Mar 18th, 2012 by lastamerikan

One of my all time favorite solid states, good power, clear as a bell, only drawback is no separate pre-outs.



re: AU-G99X

Love this amp, until started going into protection mode. Starts up, plays fine for 5 to 10 minutes- stops playing- then blinks protection 16 times- starts playing again- then randomly repeats protection sequence- has had bias and offset set- David

re: AU-G99X

This also happened to mine twice. On both occasions the problem was a cold solder on kQ1 of the power amp section. kQ1 is mounted on F-4726 driver amp board. This transistor serves as a bias to the input JFETs and it gets quite hot during operation that it melts the solder on its pins over time. Resoldering the pins corrects the issue. The only problem is kQ1 is not readily accesible for resoldering so I needed to do a little work. You may have the same problem too. You can try to confirm this by carefully moving kQ1 with your fingers and see if something happens. Refer to the sevice manual provided by this site. Good Luck!

karodimitrov's picture

re: AU-G99X

Check for DC voltage output of the amplifier and if have - adjust it to 0 V with KVR1,KVR2.Can be intermittent and due to poor filtering the power supply voltage.Primarily - should be measured.The problem can be in protection circuit too.Can be also one of the power transistors come out of normal operation due to heat,and then returns to normal state.These are only assumptions about general symptoms.Should to open and to measure by service manual schematics.

Iuri F. R.'s picture

re: AU-G99X

Very detailed highs, balanced bass not so deep but smoth like velvet. Perfecttly hi end sound, set with a pair of brand new rtiA7 Polk + Van Den Hull cables. 10/10

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