Help! Aronov Amp Fuse - Where to find?

Blew a tube and corresponding fuse on one of my Aronov amps 2 days ago. Replacement tubes get here tomorrow - but can't find mathc for the fuse so far. Fuse is rated at 5 amps, 250 Volts and has a spring/coil inside. Cna find slo ble and fast acting fuses with same rating, but no spring. There are no markings on fuse other than current and voltage. Anyone know what these are and where to find? If not, a POV on whether I cna use a fuse of w/ same current and voltage rating even if it has no spring? Been trying to reahc Arononov via phone w/ no luck!! THANKS FOR HELPING!!!