Tweaker 15w combo. Bought it used $350. Had an NOS 12au7, and 2 Tung Sol's in it. First thing I did was run it through every electric guitar I own (six) and then I tried every tube combo I had in my immediate possession (12AX7 = GT-C, JJ, Sovtek-WB, No Name, Fender, Tung Sol, NOS & 6V6= Ruby, JJ, EH) I ended up with the NOS & Tung Sol and JJ's. Big Vox & Marshall type cleans and marshall-like growl. Nice amp. It will be a great addition to my others. My only complaint is that it has TOO MANY options. Sometimes you just want to plug into it and play.