Back in the 80's, reviewer/guru Martin Colloms raved about similar US 'high end' valve amps from ARC, Quicksilver, VTL, C-J and so on and made all manner of excuses about measurements not correlating with what he and the listening panel heard. Indeed, it became a thing that all the best measuring amps tested in 1980's 'Choice' books more often than not, did badly in the listening tests, as the lack of added character usually made the sound leaner and with less 'depth' perspective (added compression in the favoured ones?) and most recommended or best buy amps were somewhere in the upper 60's 70's for estimated sinad. In the UK, this reviewer became 'important' as he had interests all over as consultant, designer and so on and people took notice of his reviews.
I'd suggest this Carver box is exactly how it's supposed to be, giving a wonderful sonic character.
Did you 'listen to it' Amir ('cos 'we' don't listen to test tones, do we?). Sorry for that, but that's going to be the audiophile response to this review... Would be great if this distortion 'grass' can definitely be heard as against a pile of cheaper alternatives that don't have it...