Sansui AU-717

@chocaholic 

If you are concerned, take the top off and look for puffed out or leaking Caps. If you see something, get it fixed. If you don’t, you’re probably good to go.

All the best.

every vintage piece I've had that sounded good, sounded better after a quality refurbishing...can't imagine all those 45 year old caps are in top shape...and like the oil change/spark plug analogy, if a cap goes, it may not go gently...so I would at least have a professional make the decision

I recapped a PS Audio power plant some years ago. Yah sure it worked fine and the caps were not bulging. They were however very dry. In fact, you could shake them and they sounded like baby rattles!!! So this nonsense of "it looks good to me" or "don't fix it if it ain't broken" is never something that I assume. 45 years is good luck on your part, but as someone mentioned here. it might not go quietly in the night and that's that. Hostages could be involved.

When redone, the AU-717 offers an additional level of detail without loss of the essential Sansui character. 

Such a lovely vintage Sansui deserves a health check by a competent EE,  as it is inconceivable that the amplifier will not be running out of bias at the very least.

Likewise miraculous were a good number of lyrics and carbon resisters not to have drifted well out of specification, ergo you will not be experiencing that AU-717 as it was designed to perform.