that doesnt really surprise me. angus had a signature gibson pup (he only really uses the bridge pup) and it was thin and bright, it works great with a wall of real marshalls into 4x12 cabs, or even a little 5e3 tweed deluxe. into modern amps, it tends to sound thin, but if he was using a jb or distortion or even custom, it wouldnt sound like classic. angus. you can tell when he went through phases of using hotter pups and the tone isnt classic ac/dc, even it it still sounds great