#1
My Fender Princeton, it won't turn on...my Dad thinks the fuse has gone...is he right...basically I brought it back from a gig (outside)...it was quite hot...has the fuse gone ?
#2
Maybe, but it's the first thing that you should check in any case

If you replace it and it works then all is well.
If you replace it and it blows out again then something is broken.
If you replace it and it doesn't work then something is broken too (might be the tubes, might be something else inside the amp)