We use two types of Slide Power Switches, both featuring Silver-Plated, Double Pole/Double Throw (DP/DT) contacts for enhanced reliability and to extend switch life. The silver-colored switch, made by Switchcraft, is rated 5A @ 125VAC and is designed for use in the Dyna-70, and uses a 3A Fuse.  Given the Dyna-70 usually only operates around 2.5 Amps, this switch should last the life of the amplifier. The Black Power Switch is for the Dyna-120 and is rated at 12 Amps @ 125VAC and uses a 5A Fuse.