Close enough for me! Doesn't have the sizzle and compression that a marshall does on 10 and sounding like it is blowing up BUT you found the key which is to lower the gain on a very high gain amp. I thought channel 2 was supposed to be the ticket for this sound but i like your approach here, super high gain (which is what the red channel sounds like to me) but gain rolled back to 9 pm which is squat for that channel. The rest is the pup pushing it. Personally, I really like it. A little more polished than the original marshalls but honestly, the more i hear this amp in action from people who know how to use it, the more i am intrigued. For one, the clean channel pumped all the way up sounds like that early AC DC and responds the dynamics the same way. If you listen to those early records, Angus sounds like he is getting most of his gain from how hard he hits the strings and maybe a boost of some type for his leads. the rest of the time the crunch chords sound way cleaner to me. I'm thinking made in vietnam or made in mehico, who gives a $hit.. circuit is a circuit and as long as they are using decent quality parts. Take a poll as to what people will find more important, a very affordable amp or made in america and supporting american pride. I think the answer is clear without asking any questions!
Oh! and i def need a 421.. love the combo sound there.
