Of course don't power it back on, once it's gone bang it's hardly likely to work again without repairs!
You wouldn't have received an electric shock from it if you had been touching it at the time, the earthed chassis would make sure of that, or double safety insulation, depending which class the product is.
The fuse is to prevent risk of fire, it does not typically protect components from failure, and they can go with quite a bang (and an awful smell as you noticed!) during overloads well below the breaking point of the fuse. Even if the amp had been unattended there should have been no risk of fire, unless you had seriously blocked up the vents.
Open her up, the caps will discharge in a few minutes in equipment like this, either through the amplifier circuitry or the (hopefully installed) reservoir bleed resistors. We can get a look at what part(s) has failed and estimate whether repair is economical
EDIT: Your link reveals a worrying design oversight, that there is internal mains wiring pre equipment fuse. A good reason to use an IEC with fuse drawer, but I can't blame manufacturers for not using them since it allows the customer to fit incorrect fuses, or tin foil...
