hifi engine

Manual Library / Sansui

Sansui AU-7700

Stereo Integrated Amplifier (1974-76)

add a review (4 reviews)

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

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


instruction/owners manual   English Deutsch Francais -

brochure   English -

service manual   English -

schematic   English - pevira

Related Catalogues

HiFi Buyers Guide

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.


 Login or register to post reviews

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 ht.chuong

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.