Sansui AU - 919 Thrift Store Find

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?

Congratulations!You found a treasure.These are great sounding amplifiers.I just picked AU719 in excellent condition and I can't believe how good it is.It has power, clarity,3D sound-stage and very good mid-range.In my opinion it is hard to find something sounding so right even for more than $1000.00 today.

You payed too much.

You paid a reasonable price i say. With some maintenance and repairs, you will have a beast.

You may have some caps that need replacing; might be easy to spot especially if they are bulging or leaking.