"It turned out that one of the contributors to Fil's SoloDallas blog had come across an old interview in Guitar Player with Angus. Asked what special effects he used, Angus answered, 'I don't use any… I only use a Schaffer Vega wireless.' That got Fil and his contributors to speculate, 'Why would anybody use a wireless in the studio when he is only a few feet away from the amp?'
Angus says, no effects... at least in the Back in Black era
here is the whole thing:
http://www.guitarplayer.com/effects/...ar-sound/48728