 The Cyber Twin, which combined a tube amp with a digital processor, was introduced in January 2001.Many notable musicians have used Fender Twin amplifiers, including Mark Knopfler, David Gilmour, Chuck Berry, Mike Oldfield, The Beatles (1968 Twin Reverb amps using the AC568 circuit), Jimi Hendrix, Eric Clapton, Keith Richards (Rolling Stones), Steve Jones (Sex Pistols), Jerry Garcia (Grateful Dead), Eric Johnson, Joe Bonamassa and Tommy Emmanuel.The Fender Twin has gone through a number of changes over the years, both cosmetically and electronically.