I've once owned that amp (great btw). The a/c fuse is adjacent to the power cord IEC. As I remember, it's a small plastic door/cover that pops open w/a small screwdriver & the fuse is held in place horizontally & I believe there is storage for a spare under the door/cover. I once had to change that fuse when a 5U4G rectifier shorted & blew & took out the fuse. IMO, I wouldn't mess w/so-called fancy fuses. The manufacturer of my present amp is strongly against the use of them in his amps as they have caused alot of problems.