Can anyone suggest a quick (and cheap!) fix for my Orange practice amp. It's hardly been used but now constantly blows it's main fuse when replaced. It started going 'funny' after i used a twin jack socket to play bass & guitar simultaneously through it with a friend..possibly not a good idea. I've replaced the fuse with a non-blow type and it now just hums & growls angrily at me. It's out of warranty so not really worth paying anyone to fix it..think they retail new at around £80? Got a little video clip if anyone wants to see it. Any help appreciated!