Introduced by Jennings Musical Instruments (JMI) in 1957, Vox began building amps to satisfy the emerging amplified rock scene in the UK. By '61, they were producing guitars and added an echo effect unit in '63. Known for their unique shapes and innovative electronics, Vox became a staple of the early British rock bands. If there were a Mt. Rushmore for guitar amps, the Vox AC models would definitely be carved in stone. The AC15 and AC30 models (Named for their respective wattages) were the sound of the British Invasion; In fact, The Beatles were contractually obliged to use Vox amps onstage exclusively. The Rolling Stones, The Kinks, The Animals, The Yardbirds, and, later, Brian May, the Edge, Rory Gallagher, Mike Campbell, and Pete Townsend, all made good use of the Class-A AC30's signature growl and jangle. Every studio has one (or needs one).