On amp construction
Consider this: Why do you care what's inside the amp? Do you like the way it sounds, or not? How long do you plan to keep your amp? Are you planning to pass it on to your grandchildren? How long have you been playing? Are you set in your ways, stylistically and tonally, or are you still searching for an amp you can live with?
My point is this... Unless you're looking for an investment - or for an amp that you know you'll want to keep for more than a few years - then there's not much point in worrying about the non-tonal details.