DSL40C. I'm having a little more difficulty dialing in a good sound than I did at GC but I'll get there. This is the first tube amp I've owned in about 30 years, my first tube amp was the one that was built into a Silvertone guitar case which somehow vanished over the course of three divorces...anywho, that's if you don't count the VTM120 I had several years ago. Oh, and I got Sweetwater's free Creamback upgrade.