Speaking of the normal channel on the JTM-45 for AC/DC tone, I found this interesting bit on Malcolm Young Wiki page.
"Angus and Malcolm Young both use Marshall amplifiers. The amps stacked behind Malcolm onstage are two original Marshall 100 watt heads, one 1966 JTM45/100 and one late Superbass from the late 1960s or early 1970s. Each head powers two 4 × 12 cabinets. Malcolm also uses custom-made Wizard amps on tour. Malcolm's main amp, since recording Dirty Deeds Done Dirt Cheap in 1976, is a slightly modified Marshall Superbass from the late 1960s or the early 1970s. On Ballbreaker, he used a Marshall JTM45/100 with KT66s and a high B+ voltage (625 volts). In a recent interview with Marshall Law, Malcolm mentions his two favourite amps: a Superbass and old Super amp (JTM45/100). Also Malcolm used 2 Orange full stacks in London, England on 13 July 1976 while playing "Jailbreak", "Live Wire" and "Can I Sit Next To you Girl," with Bon Scott. While AC/DC were playing at Donington Park in 1991, Malcolm used Mesa Boogie stacks.''
There were updated versions of the presets going to 2c to take into account of the new modelling tweaks.
