If I remember correctly Jim had a Rocktron Voodu Valve running into something like a PA amp, don't hold me to it, but he switched to a Randall MTS when he got endorsed. He could have used something else at the studio though.
I recall Jim telling me a Marshall poweramp was involved. Wait, do they make those? It's been a long ass time since he told me haha
Maybe it was a JMP, actually.
I didn't think QSC made a crappy product, I thought they were pretty well-regarded in the live sound world? And as we all know, not all SS power amps are created equal