So many years ago, I bought a Threshold power amp, and it was an 'S' series, maybe 400 model? The point that I will make here is that even back then, I was surprised to see how ancient it looked with old brown carbon resistors, thin circuit boards, and more. To me it really looked used. I mention this because in some newer equipment, I see thick circuit boards metal film resistors and the electrolytic capacitors have come a ways since the cave days. No doubt there is equipment built in the past that was great then and now, but I didn't find that to be the case in the Threshold amp that I had.
I wish that I could speak to the more recent products designed by Mr. Pass, but the only power amp of his design that I owned and loved was a Forte' model 3 which quite the opposite inside from the Threshold. Then again it quite a few years newer so there is that.
The Pass products that I have seen recently have good quality in places (I am now referring to some of his kits) but not so much when it comes to the chassis. Not bad at all, but certainly not built like a Krell either. His consumer products I have not seen to get even an idea of the build quality.
I am not saying that any one of these products sound good or bad, but I am just as interested in the build quality as the sound. I know, a rare combination.