Longevity (our gear not us)

Is there a question in there? Sounds like your amp is working well and you are wondering if you should be concerned?

I’ve owned non-mechanical components from Threshold, Pass, Audio Research and a number of other brands over the last fifty years, some for twenty years and have never needed a single component repaired. High end equipment that has not been abused should last nearly forever. Although after twenty years a refresh of the capacitors and a few other discreet components are need to maintain sound quality.

@ghdprentice Sorry for the lack of clarity.  If the failure issue so seldom arises why is the possibility weighed so heavily in the selection process?

Hmm, good question. Not sure,

I guess if you are exposed to the forum, then folks are talking about all levels of equipment. The lower tiers are much more unreliable. Then there are stories about high end equipment that has been abused. And, I admit, I don't understand how you "abuse" a piece of high end equipment. But I am sure this is true. I have seen a component or two that looks like someone put it in the dryer and rolled it around. But, someone buys this used and it is going to require work. 

For me, it does not figure into any purchase for all practical purposes.