Replacing blown fuse on wurlitzer 200a

[theopolis]

After many years of playing my wurlitzer without any issues, the main fuse blew when I turned it on the other day. I have all the parts to replace it, but my question is, should I? Do the fuses wear out, so to speak, or is there possibly a bigger issue that caused the fuse to blow?

Thank you.

[theopolis]

Well I replaced the fuse and it blew as well. Anyone have an idea what could be causing the fuse to blow after having no issues for several years? There's a loud 60hz hum when I turn it on and then it shuts off.