I have a collection of amplifiers that I uses but for the majority live work I'm using a Matamp 1224 GT head and 2 x 12 cabinet with Vintage 30 speakers.  I also use combinations of Fender Devilles, Twins, Deluxe Reverbs and Blues Juniors as well as a Vox AC30.  I sometimes use a smaller, low powered head like an Orange Tiny Terror with my Matamp 1x12 Vintage 3- loaded cab for studio work or smaller shows.