It seems like this new Mesa is considerably different under the hood than the AC-15 / Tiny Terror
type heads. The new Mesa is described as Fixed Bias, which means that it will have a much different characteristic than the cathode bias power amp sections in the AC-15, Tiny Terror
, Tweed Deluxe, etc. No mention of negative feedback or presence, but it might be in there. Plus, there are a LOT of preamp tubes in there, presumably for the dual channels. This seems more like a tiny version of the standard Mesa amps, rather than Mesa's take on the Vox type heads.