There has got to be something wrong with it. I recorded my guitar DI a few nights ago and finally got around to reamping it today. Just out of curiosity I put an amp sim on the files before I reamped. Sounded great, excellent even, so I know it's not the guitar signal. I have narrowed it down to two possibilities: 1. Bad tube - My amp has a single 12ax7 tube that has never been replaced, I got it from a friend so it's bound to need replacement. However, I don't know the first thing about tubes, you know brands and reliable suppliers and all that. I know power amp tubes need to be biased but do preamp tubes need to be biased as well? 2. Impedance mismatch between the amp and cab - Back of the head reads (4ohm min combined impedance) and the back of the cab reads 8 ohms. The sound is what got me. It sounds anemic X5. I have files, if you'd like to hear them I'll post them.