You need 3AG fuse of the correct amp rating, they are all usally rated at 240v. Sell them at Jaycar etc. Also need to know which are fast blow which are slo-blow etc
The voltage of the fuse doesn't matter unless in a high voltage situation where more insulation around the fuse wire is needed, as Dean says the Amp rating needs to be correct and the standard 3AG is fine. The ceramic fuse is most likely an old slow blow and certainly shouldn't be reading more than an Ohm or two.
