Well everything can fail, capacitors, tubes etc etc. I got my SB300 from a regular gigging TB member, and the doggone thing had the bias fail. He had zero problems and gigged often. S--- happens. The thing that must be emphasized is the warranty is top notch. Did not cost me a dime. Plus this amp, with a great cab is the best thing I have ever heard for an old school guy. I got to rehearse and gig for several months in a professionally designed music venue, and I would haul the SB300 to a rehearsal, when the Killer PA and a micro head out would have been fine. It is that good. Risk my old back at a rehearsal just so I can enjoy it!