Carver Load Invariant has three fuses: 1 10A 32V 313 and the markings beside the fuse says 120 VAC 50/60 Hz AC line Fuse
2 6 1/4 A 250V 313 2-5 Amp and the markings beside the fuse says SLO-BLO MDL/Q
2 6 1/4 A 250V 313 2-5 Amp and the markings beside the fuse says SLO-BLO MDL/Q