I recently purchased a used "evil" Twin amp on e-Bay and I think something is definitely wrong with it. This is the model with a 25/100 watt selectable power. In audio engineering terms I would say that the amp sounds like it has a phase problem, as the sound is not as directional as it should be, and there is literally *no* low end response. I compared this to my Fender Hot Rod Deluxe and Tech 21 Trademark 10 amps and both sound much better than the Twin. The Twin should be much louder and have a much bigger and beefier sound, but it doesn't, The second channel is a total joke, it sounds like a tin machine. I looked at all of the tubes (Groove Tubes I think) and from what I can tell they look OK, but I don't really know enough about tubes to tell for sure. Do you have any idea to what might be wrong? Also, the power wattage switch doesn't seem to do anything, which strikes me as *very* odd. I e-mailed the seller this morning so hopefully he'll have some ideas for me.