Angus Young’s Schaffer-Vega Diversity Systemaccess_time First seen circa 1977
The only “effect” that Young has ever implemented into his signal chain was the Schaffer-Vega Diversity System – a wireless unit that he would begin using in 1977 live and in the studio.
The unit is, however, not just a simple wireless receiver. The SVDS is unique in a way that it has a volume boost control which further overdrives the sound, and which Angus utilized extensively. This obviously was a factor, which most people were not aware until Fil Olivieri’s discovery.
Everything that is known about SVDS and its impact on Angus Young’s sound comes from Fil Olivieri of SoloDallas. Since it’s not fair to just copy/paste Fil’s discoveries here, I would recommend that you visit his website at SoloDallas.com – and read the story there.
It’s also important to note that all this research eventually led to Fil developing a Schaffer Vega replica, and a SoloDallas Storm pedal (standalone pedal that replicates the sound), both of which are available on the website linked above.