I have a much used/loved spider III 150 that blew its first fuse several nights ago. I put the backup fuse in and it blew imideately. When I got the amp home, I put a new fuse in to check how it might react on a different power source- same thing, fuse blew right away. I've got the brain out of the the amp right now and everything looks good. It's clean and I don't see any damage to any of the circuit boards. I live in the Dominican Republic so can't take it to an authorized dealer to have it repaired. Any ideas?