How to Buy a Used Amp - Premier Guitar Article July 2016, by Tim Schroeder.
So, you “need” a new amp, huh? Maybe you’re looking for a certain sound, or your old amp is no longer reliable enough for gigging. Perhaps that mammoth stack from your high-school years—y’know, the one with the lightning bolt and pot leaf stenciled on the grille cloth?—doesn’t quite fit with your current décor. Or maybe your income has changed and you finally have enough scratch to purchase your dream amp.