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Sansui AU-517

Integrated DC Stereo Amplifier (1977-79)

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Sansui AU-517


The AU-517 with it's DC power amp boats highly accurate reproduction of all signals (including any kind of musical signal), and it achieves exceptionally high circuit stability. The pre-driver circuitry is so effective in assuring stable performance in the face of temperature and voltage changes that Sansui has registered it with major patent offices around the world.

The subsonic filter attenuates harmful frequencies from 16Hz and below on a 6dB / octave slope, yet keeps musical content intact.

The potentiometer for master volume control is a precision attenuator type with 32 accurately calibrated steps marked in decibels (dB). By a simple calculation you know how much average power you are feeding your speakers.

The AU-517 has full monitoring/recording/dubbing facilities for two stereo tape decks. All play/copy operations can be handled by a trio of switches and a rotary knob, permitting a number of practical uses.


Power output: 65 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.025%

Damping factor: 60

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

Signal to noise ratio: 78dB (MM), 100dB (line)

Channel separation: 60dB (MM), 65dB (line)

Output: 150mV (line), 1V (Pre out)

Speaker load impedance: 8Ω (minimum)

Dimensions: 430 x 168 x 389mm

Weight: 16.5kg

Year: 1978


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Reviewed Dec 22nd, 2018 by

Owned mine since 1978. Still going strong strong with no issues. Drives Rogers speakers using Cambridge Audio CD player. Nice crisp sound . No degradation with caps I expect many have had to upgrade at some expense too. I also use it to hook up to TV for sound. Great with PS4 too enjoyed playing Clapton Crossroads DVDS yesterday.

Reviewed Jan 18th, 2014 by

Second best amp I have ever owned, the Sansui AU-719 was my favourite. This is a close second. Good clear sound with lots of definition. Good bass response without losing the crispness of the high notes.

Reviewed Jan 13th, 2014 by

Very high quality amplifier;
Nice phono stage;
Smooth with details and excellent bass section;
no noise and very low distorsion;
strongly recommended.

Reviewed Jul 28th, 2013 by

Excellent amplifier. Very similar to the popular AU-717 (similar faceplates, true dual mono design, etc) but with 20 watts less per channel and simpler tone controls. Superb phono stage; no noise or hum even with the volume very high. Overall character: smooth yet detailed with well-defined bass. Highly recommended.



re: AU-517

Sometimes, the amplifier goes in protection mode with loud volumes because the DC (0 Hz) frequency response that it has, maybe your source or a block inside the amp by self is sending some DC and it is amplified to a level unsafe for the speakers.

re: AU-517

I just purchased the sansui AU - 517 AMP. When I turn the volume up loud it goes into protection mode. The question I have is why?

re: AU-517

It is normal for this amp to go into protection mode when the volume is turned up loud. In fact he can go into protection at low volume with very reactive load.

re: AU-517

What source devices -- particularly those connected to high-level inputs (tuner, aux, cd, tape) -- are you using with the AU-517?

I'm not a real tech wiz, but I have been reading some audio bulletin board discussions (including Audiokarma) which say that source devices made in recent years put out a lot more signal than those of the AU-517's time (the 1970s). The higher strength signals cause the amplifiers to put out more power, possibly to its limits. Of course, this may not necessarily be what causes the protection mode to kick in, but just keep this in mind until you know for sure what's causing your problem.

If the part (or all) of the problem is highly strong signal levels from more recently-made source devices, an option to explore is signal attenuation -- IE, the use of special cables connecting your source device to the AU-517 that lower the strength of the input signal.

Again, I'm not a real expert, just quoting what I've learned from other sources. Best of luck in successfully resolving your issues.

This website is not affiliated with or sponsored by Sansui. To purchase AU-517 spares or accessories, please contact the company via their website or visit an authorised retailer.