Stereo Integrated Amplifier (1974-76)
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
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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.