#1
I recently bought my first tube amp a used Port City Twelve single channel 12w head and it blew the power fuse. The fuse is a 1A 250VP 313. I went up the the store and bought a slightly different fuse. 1A 250VP 312. It blew immediately. The filament in the fuse I bought is much thinner than the one that came out of it. Is the diffence between the 313 and 312 slow and fast burn? I have also read where some guys will replace the 1A with a 2 or even 5A if there power fuse goes out. How sensitive are the components when it comes to and amp spike?

Thanks
#2
You're going to want to change your fuse to exactly what the amp requires.

I'd also change your power tube or take it in to a tech, your amp blew a fuse for a reason...
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#3
Thanks man that's what I figured. I hadnt really thought about the tubes being a problem but it makes sense cause it was left on over night a couple times after we recorded.