Re: Angus Young tone
AC/DC's sounds are really nothing more than what was normal back in the late 1960s/ early 1970s ... big, powerful and relatively clean tube heads (pre master-volume), driving a bunch of 12" speakers. Guitar connected to the amp via a single cable. The rock was obtained by simply cranking them way up ... almost totally phase inverter/ power tube overdrive. By the early '70s we were all discovering that some kind of simple booster between the guitar and amp was helpful. It was all very simple, very primitive but it worked.
I haven't followed AC/DCs gear, and it's possible that they experimented with technology in the '80s and in the years since then, but the sounds have never strayed far from the early '70s ethos i described above (to my ears anyway). I did read an interview a long time back where it was said that the backline was all 100 watt Marshalls, possibly '80s models, but the amp that Angus had mic'ed up for the PA was a 50 watt, non-master Marshall.