Where to Buy Fuses for my OTL power blocks?

The 500V part of this probably isn't real. That's an arc rating, and normally if dealing with US AC power, a 250V rating is recommended.
Since this is a tube amplifier, a slow blow fuse is likely. I suspect that the 15Amp part of it isn't right either. Is its a stereo amplifier or monoblock?

Found what i need. Thanks and sorry for the trouble.

Here's the problem with your plan: you're used to the way your amp sounds with the Black fuse. So when you stick the crap one in you are gonna think your PSU is broken. So you send it out for repair. And $500 later it comes back with a note, "Tested. Replaced crap fuse. $150 Blue Quantum Fuse. $350 Labor."

So the Blue will actually save you money. Buy from highend-electronics, they replaced one of mine for free when it blew.

I appreciate your opinion, However i do not believe my ears can tell the sound of a Fuse, Im not there yet;-)
Thanks!!

go to allfuses dot com on the web.

they sell tons of unique fuse types.

Thanks!