De-Modding a Marshall - Premier Guitar Article from January 2009.
Amplifiers have always been close to the electric guitar players’ hearts. It’s often a love/hate relationship. Love, when your amp is performing as it should, never letting you down no matter how hard you push it. Performing night after night without hesitation, giving you the exact tone and feel that you ask of it. And hate, when your amplifier is doing things that you would never ask it do, often, totally on its own. From a faint crackling sound reminiscent of a distant fireplace at your grandfather's cabin on a wintry night to the blood-chilling screeching that a harpooned pterodactyl might make in the troughs of death.