Sansui AU - 919 Thrift Store Find

Only issue so far after running this for over 4 hours on the lowest volume setting I lost a channel. Powered the unit off for 30 seconds with the unit on a higher volume and the channel is back. Weird. I guess this unit does not like that low volume setting. I ran it for 3 hours on normal (Whatever that is) and higher volume levels without issue. Phono, Tape, and Aux inputs. Might have a cold and need to see the doctor.
Kidding aside Sansui is known for channel issues. I have had channel issues with the 9090, and another receiver from the G series. Sounds great at the moment.

I think it might need output transistors. Also someone mentioned that the AU-717 was similar to the 919 with just more power. Not so. They are both quite different.
Funny about loosing the channel. Hours after I re-started the unit it lost the left channel, and the right was fine. The unit can be ran for hours before it does this. Weird. But not surprising. I mean who dumps a nice working Sansui AU 919 at the local Goodwill.
Although I have been surprised. One of my finds was deleted from the postings on here because I guess it hurts the sellers of these unit on here. And that unit works fine, and is more recent. Early in this decade production
Anyway when the Sansui was running it sounded great! $50 admission, and service fee won't hurt. I am flipping some pieces so I might put the funds towards a service. Or I may attempt to repair it myself.

Got an email from my tech this morning. I described the issue I am having with the amp to him in an earlier email. Here is what he said:

That series of Sansui amps had a problem with the
glue they used to hold down some of the caps during
wave soldering. Over time it became corrosive and
even conductive. There is a pre-driver board (The
vertical one) that needs the glue scraped off and
any corroded parts replaced.

The protection relay is also on this board and it could
also be the culprit - dirty contacts.

I doubt that it would be the outputs, transistors die or
maybe get leaky but rarely heal themselves.

And no, at the moment I cannot get the amp to him, and he really likes to work on Yamaha's. He is a good guy with a great deal of experience.

I went through and cleaned all the switches. Something I did not do initially. Seems like it's working fine now. Ran it for a few hours last night. And about an hour + on the lowest volume setting.
Man this is an awfully nice sounding unit. Are these modern amps built like this that much better? Especially some of the more expensive, small units. What can you get for $500 that is built, and sounds like this. I have been playing around with audio for few years. You have to spend to much to get something comparable. I will say that most vintage receivers are highly overrated, and not worth the money people are spending on the big ones. The Sansui is a bargain.
Johnss thanks for your response, but did you read the post prior to yours?

Well here I am 13 Months later and the Sansui still runs like a champ. It truly is a great amp and deserves all the accolades it receives.
I would like to get something modern, but I think I would have to cross the $1000 threshold and then some (Musical Fidelity A 308) on the used market to get something to beat it.
I have a Rotel RX 1050 and the Sansui beats it quite easily.
Eventually a Re-Cap and resistor replacement should be done. Just can't swing it now.

Best -L-

Sony 222ES CDP. Running a pair of Yamaha NS 1000's with it. The Tannoy's just don't compare to the Yamaha's.
From what I understand the 717 is quite different from the 919.

Thanks Doug99 but I can find somebody in the area to revamp the unit if need be. There is one guy who is very well known but he says he is not taking work anymore. He is in his 80's so I can't really blame him. But I might be able to convince him otherwise.
The amp has been getting hours of daily use since I acquired it over a year ago.