Mad Professor Big Tweedy DriveFender high power tweed Twin was made from 1957 to 1960. It has become the most sought after vintage amplifier, because it is one of the best sounding amplifiers of all times. It has been used by players such as Keith Richards, Eric Clapton, Joe Bonamassa and the late Rory Gallagher Just like the original Fender Tweed Twin from the extensive Mad Professor amp collection, the Big Tweedy Drive has the tactile touch sensitivity that players rave about.