It's a Marshall Code 100 modeling amp head through what used to be a Monoprice combo amp, but the amp took a dump and it is now just a speaker cabinet. I bought the cabinet today off of Craigslist because I was planning on buying one of those DIY tube amp kits. But I plugged the Marshall into it just to make sure the speaker works, and the tone has been blowing me away. I have the amp set on the "American clean" setting, which I guess is based on a Fender, with the preamp cranked to give it a little bit of dirt. This thing is oozing vintage tube tone, somehow. I don't know what kind of speaker they put in those Monoprice combos, but whatever it is, it's a perfect match for that head.