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Sansui AU-7700

Stereo Integrated Amplifier (1974-76)

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Sansui AU-7700


Sansui's prototype of the AU-7700 created a lot of excitement in our audio engineering division.

Here was an integrated amplifier of moderately large power output, very low distortion, sophisticated tone controls and source handling capabilities and much more.

Features of the AU-7700 include terminals for connecting up to two pairs of speakers, circuits for handling two tape decks, terminals for connecting up to two turntables, selectable pick-up load, versatile control of tonal quality and high and low filter switches.


Power output: 54 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.1%

Damping factor: 30

Input sensitivity: 2.5mV (MM), 100mV (DIN), 100mV (line)

Signal to noise ratio: 75dB (MM), 85dB (DIN), 85dB (line)

Channel separation: 75dB (MM), 85dB (line)

Output: 100mV (line), 30mV (DIN), 0.8V (Pre out)

Speaker load impedance: 8Ω (minimum)

Semiconductors: 57 x transistors, 22 x diodes, 3 x zener diodes, 1 x LED

Dimensions: 434 x 130 x 315mm

Weight: 12.3kg

Year: 1975


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Reviewed Feb 16th, 2019 by Oliwood77

One of the best be sure this machine is a piece of Art, sound is warm & the scene is onbelievable open. I have a lot of Sansui amplifier and this is one of my favorite because there are a lot of connections (2 phono 2 aux )

Reviewed Sep 07th, 2018 by vintagefpp2

Este amplificador se la serie AUXXXX puede llegar a superar todas las expectativas que usted tenga con respecto a el, a pesar de su potencia moderada en la parte de calidad sonora esta muy por encima de la media ya que puede responder satisfactoriamente a un gusto musical muy exigente.
Si esta pensando en una posible inversión en audio de calidad esta podría ser una muy buena opción junto con unos buenos parlantes de tamaño mediano y con buen diseño acústico ej: marantz imperial 6 no sera necesario exagerar en potencia y tamaño!

Reviewed Aug 07th, 2017 by richard51

Sansui has a long history about emulating and reinventing a S.S. amplifier that will sound like their mythical tube amplifier au-111...Alpha series amplifier like Au-X701 was one of the first that begin to materialize their goal...But after listening precisely to the Au-X701, a TOTL amplifier for sure, i can assure you that the AU-7700 is indeed one of the best amplifier that Sansui has probably designed, tube-like sound almost as detailed than the 701, more analog sound than digital in fact...I keep it...

Reviewed Jun 04th, 2017 by Emilien

If I had to choose one Sansui integrated amplifier, if not one transistor amplifier, it would be this one.

It has some problems as :
- not very good cooling, so don't use it at high power level.
- no overcurrent protection of output transistors, take care not to short circuits loudspeakers output.

But this amplifier is very good sounding...this is truly a dream amplifier.....

Reviewed Apr 15th, 2017 by vitapro

I am lucky to have 3 of this amps AU 4400, AU 7700 and Au7900...I love most 7700, its pre is absolutly amaising...try it with valve end...it need to be hear...can not discribe the sound absolute live performance, very musical...great SANSUI!!!
AU 7900 sounds great too, but a little dry and tight...more close to digital...
Au 4400 comparing to others is light in bass but has exelent mid and hights...
Source is high end turntable, ofcource...

Reviewed Jul 20th, 2016 by chrismoon

I managed to obtain one of these recently which turned on but nothing else. I took it to my tech who's specialty is vintage amps. He described it's condition as one of the most abused amps he's come across. Well, after many hours spent trouble shooting, replacing transistors on every board and adjusting the bias amongst other things this beauty is singing once again. Money well spent! My favourite feature which I have only seen on the au-7900 is the low/high boost, fantastic for listening at low volumes. The pre-out works great connected a powered subwoofer. The most versatile and best sounding amp I have ever owned.

Reviewed Jun 07th, 2016 by Rudy Deblieck

When young, I owned an AU5500 and really enjoyed it for years and years until I lost it in a divorce. I am now approaching 60 years and recently I bought a completely revised and restored AU7700, so it is in better than mint condition, for my vintage 70-ies set in the basement. Although I have a far superior Audio Note top of the bill high end chain as well I thouroughly enjoy the musical sound of this amplifier. In its days it was considered high end itself. And the sound indeed is much more reminiscent of the nowadays tube amplifiers than the boring & bland trannies. The AU770 comes loaded with a lot of extra features, like separable pre/main, 2 phono entries of different sensitivities, complete monitoring capability for 2 tape recorders. Tuneable frequency pivot point tone controls that can be completely defeated. Midrange tone control. Tuneable filters for low and high frequencies.
Sansui, just like Kenwood, Luxman and Pioneer partner very well with vintage KEF, Celestion, B&W or Wharfedale speakers. I have mine partnered with the truely enjoyable KEF Cadenza. A marriage made in heaven, really you should try it. So much more fun to listen to than contemporary cardboard HiFi.

Reviewed Sep 22nd, 2015 by guest

Very good amp !

Reviewed Aug 30th, 2014 by Frederose

Great amplifier, warm and crisp tone, much power and dashing look.




I also have this amp. Iv'e had it for about 20 years and use it in my garage. Verry powerful..They dont make these like this anymore. Awsome sound and love all the filter switches. Nice unit.


I own one!
sounds great, BUT in a dumbass move i hooked up a pair of 8ohm speakers to A, and a pair of 4 ohm speakers to B, now it has no sound, what needs to replaced or repaired to get my sound back?
im afraid its the output transistors, any clues?

re: au-7700

some transistors burned

i will help you

but i am in san francisco

as far as I know, this amply

as far as I know, this amply only accept 2 set of 8 ohm speakers for systemA& B or 1 set of 4 ohm speaker. It cannot be combined.


re: as far as I know, this amply

You are right. You can't combine 8 and 4 ohm speakers on this unit. I've had the same problem pimpnasty had but managed to get my amp sound back by replacing two damaged transistors. It was very trivial and easy to find out what was burned. This unit is great, I wish they were on the market again.

-Jaime Garcia Dias

This website is not affiliated with or sponsored by Sansui. To purchase AU-7700 spares or accessories, please contact the company via their website or visit an authorised retailer.