But the INT60 is 60 watts, right? And Jim Salk said 100 watts minimum, right? I suspect the answer for this Pass Labs stuff is going to be in the "not all watts are the same" category — right?
Without getting into too far into the weeds, "Yes".
And, once you’ve heard a really great SS amplifier circuit design with larger super-high-quality transformers and capacitors, blah blah, you’ll be amazed how LOUD and FULL it sounds only playing 1.5 to 2.0 watts. A few local mentors showed me long ago why they say "it all starts with the transformers", and why I needed to come over to the tube side too. The truth is, I like both, really great tube amps and really great SS amps, but they are big $.
With Nelson, it seems to be his tenacity to explore different circuits, transistors, great transformers and good parts inside for amazing results. He started as a speaker guy ya know... where my roots came from too.
BUT, matching the right speakers with his amps is key too - and it can vary between the ".5" and latest ".8" version amps. I’ve heard his amps with super popular (unmentioned) high efficiency speakers (normally used with low power tube amps) that truly sounded horrible, like really bad, at an audio show mind you. Was floored how bad it sounded with poor speaker matching.
I bet the INT60 would whip those Wow1s right into confirmation, and much larger speakers too - but follow what @tvad said, ask Mark at Reno HiFi. I would love to run up to Pass (35 minutes away) and see about demoing an INT60 myself later after summer just to do it and compare it with my own custom speakers and my 120w mono tube amps. The only reason I have not is I don’t want to walk out of there with a pair of XA-100.8 mono amps and be hooked. Don’t need it and can’t afford it. Best to stay the heXX away from there. Caution! :)