I think Thorn was using the 100 watter which most will tell you is more "dry" and less gainy than the 50 watter versions. I think this is the best sounding one of the 5153 line from what I have heard and the one I would go with if I was interested in this line of amps. The biggest complaint on the 100 watters of not enough gain on blue channel is what makes it shine if you ask me.
OR the GREEN channel on the new combo amps. Ridiculous that this is the "clean" channel but I agree with the guy who did this vid, the green is the best for the old school tone. I think someone said these combos are closer to the stealth circuit than the others.
https://www.youtube.com/watch?v=to3ZG7PFzDs