Well, there's the likely source of the problem. If you smelled something burning it is likely the amplifier insides. Probably not something you can fix yourself. I'd pay a tech a few bucks to look at it and see if it's even worth fixing before shelling out a lot of cash. May be further ahead just buying another amp.
Couple pointers.
Just because it goes to 10 doesn't mean you should play it there.
If it sounds distorted/stressed, back off the volume.
If you need to turn it up that high, you need a bigger rig or at least an extension cab to put under that one.
