Good Morning Everyone

I placed a bid on E-Bay for a Sansui AU D5.Does anyone have one? What year was it made and what is its wpc?

If I get for $40 US is it a bargain even when converted to CDN
Dollars?

Any help is appreciated

Best,

Opt80

Hello:

I have an AU-D7 in my Sansui collection, the AU-D5 is almost identical except slightly less power. The AU-D5 is 65 Watts and the AU-D7 is 80 Watts. The other two higher models in the Line are the AU-D9 (95 W) & the AU-D11 at 120W. This Line came out for the 1981 model year.

The AU-D5 & AU-D7 use a different type of circuit design & biasing called "Linear A" by Sansui, the AU-D9 and AU-D11 use the design called "Super Feed Forward". The AU-D5's & 7's came in either black or silver and had matching Tuners, the TU-S5 and TU-S7. (The AU-D9 & D11's Tuner was the TU-S9).

The top-line AU-D11 was an exceptionally good amp by Sansui that blew away the reviewers in Stereo Review June 81 & Audio magazine February 82. The D7 & D5 arent quite on that level but still very good. And if you did in fact get it for 40 bucks, thats an excellent buy.

Regards, B/F

Hi .I own a Au-d9 that works incredible. You mentioned two articles about AU-D11 .I wonder if you have them or if you know where I can find them. It would be great to have tha info.
Thanks
Diego

Hello:



I have an AU-D7 in my Sansui collection, the AU-D5 is almost identical except slightly less power. The AU-D5 is 65 Watts and the AU-D7 is 80 Watts. The other two higher models in the Line are the AU-D9 (95 W) & the AU-D11 at 120W. This Line came out for the 1981 model year.

The AU-D5 & AU-D7 use a different type of circuit design & biasing called "Linear A" by Sansui, the AU-D9 and AU-D11 use the design called "Super Feed Forward". The AU-D5's & 7's came in either black or silver and had matching Tuners, the TU-S5 and TU-S7. (The AU-D9 & D11's Tuner was the TU-S9).

The top-line AU-D11 was an exceptionally good amp by Sansui that blew away the reviewers in Stereo Review June 81 & Audio magazine February 82. The D7 & D5 arent quite on that level but still very good. And if you did in fact get it for 40 bucks, thats an excellent buy.

Regards, B/F

Hi,
The AU-D5 & AU-D7 use a different type of circuit design & biasing called "Linear A" by Sansui, the AU-D9 and AU-D11 use the design called "Super Feed Forward".
Could You explain what is "Linear A" design? Class-A power stage? AU-D5 (and D7 too) has relative high THD at nominal output power. How it sounds?
Regards,
F.

The sliding bias circuit avoids the inactive output device from completely cutting off so that it idles at its nominal quiescent current during its inactive phase. In this way they can claim that the output transistors conduct during both halves of the waveform even though the normally inactive transistor does not contribute to driving the load. That's why they call it pseudo class A etc.

Many years ago I had a AU-D5 given to me by someone else who tried to fix it and no matter what I did to it, it continuously kept latching up and blowing output transistors even when using the original devices. I changed everything around the output stage and nothing fixed it. It was a real curse :(

Those sliding bias circuits are a bit of gimmick because they really don't do much to reduce output stage distortion. In fact in a lot of cases they just make it worse. From a reliability perspective you'd be better off converting it back to a temp compensated Vbe multiplier which would operate much the same as an AU-719 or AU-819. In fact in the end this was the only way I could make it work properly.

Just my 2 cents worth.

That is to say a blind alley in Sansui circuit design technology? Thank You for information.
F.