Whenever I search, I get pretty much 50/50 answers. I think it's not tube but i'm not sure. The Valve Drive button is what I think misleads people. Is it just an emulator (like I think) or does it actually drive the (supposed) pre-amp tubes. If it does have tubes, what would be the point in the new Spyder 550; it would be the same amp in a new casing. Side note: The new Little Bastard wouldn't be too good for bassists (not enough power) but i'm willing to bet that it'd make a killer guitar amp. PS: IDK if this has been said, but the entire Valve series is officially on sale in the UK. Don't know about the US though.