Sansui AU-111 vacuum tube amplifier

I used to service those amps back in the day... At the shops where I worked I tended to be the one doing the tube equipment when it showed up.

The output transformers were pretty decent. But the parts quality was pretty bad. They used paper and oil coupling caps but had reliability problems (I've seen them leaking more than once). The tube sockets were terrible and were prone to bad connections.

I can't comment on the sound- its been too many decades since I last saw one. At least I can say that when I fixed them they didn't seem to have any troubles lasting out the service warranty of the shops where I worked. 

I agree that the Sansui AU-111 is amazing, and to me would be the piece to own.  Sansui is the one company who’s solid state gear also sounds wonderful.  I have many Sansui receivers both tube and solid state along with several integrated amps, and all of them share a sonic sweetness that you won’t hear in other brands.  I have a 9090db that seems to do everything just right.  But I still pine for an original AU-111.  

Vintage Marantz  sound,  both tube and solids state is more laid back and not sweet like Sansui, but still very very good and easier to find.

I love them both. Keep in mind anything that old will need proper service.  
N

I have a Sansui AU-111 purchased while in the Navy on Guam in 1968. I still have it, and I don't think there is enough money to make me part with it.  I am a electronic tech, and have been servicing all types of electronic devices for more than 50 years, and have never heard a better warmer, richer, or more accurate sound than from the AU-111.  I completely restored it, replacing ALL capacitors, balanced the 6l6GC plate current, etc.  It is in immaculate condition both visually and technically, not a blemish on cabinet or interior.  Have it paired with Polk SDA II speakers.  I was also was able to obtain a pair of original A-603 MC transformers from one of the Sansui officials who had a lot of original parts  purchased from Sansui when they shut down operations.  He was living in Michigan when I located him.  I have the original manual, service manual, and a second manual I found on ebay a few years ago. 
Just thought I would add my opinion to the postings.  This is my first post.ncridgerunner

Thanks
ncridgerunner for your interesting post and experience...

I bought my Sansui AU 7700 precisely because Sansui tube amplifier success and their ability to replicate it on their S.S. design...I also never look back....

My deepest regards....