Thanks guys. I've been pretty excited about this amp. I'm a total nut for early EVH and DeMartini type of tones, and this amp definitely gets me to my happy place without needing to run too much volume.
In response to harddriver's comment regarding the master volume... wish I could elaborate on the technical part of why this amp works so well for me at low volume, but I'm not very savvy in the realm of amp building; the technical explanations often end up being over my head. Whatever Glen Morris did though, he killed it with this amp for sure. A cranked up non master Marshall is my favourite sound in the world, but there is a price to be paid eventually. I told Glen that this is the amp that will save my hearing. When I first tried it, I was pretty knocked out by how good it sounded through my 2x12, with the volume set low enough for a small club gig.
(And just for clarification, the first two clips in the OP are ones I recorded last week. The third one posted in the OP is one that Glen Morris made a few months ago and is much more extensive in terms of going through the controls and such).