I blew up my receiver. Now what?

Good ,  you got lucky  now you can buy an nice intergraded gear  and not the mid fi thing you blew up  

How can you plug a 110V device into a 220V outlet be cause the plugs are different. Second, I'm pretty sure that the power supply is toasted. Unfortunately, power supply is one of the expensive part in your receive. Only the manufacturer may have the replacement part.

Better the receiver then you receiving 220 volts, it is after all, just a receiver. The only thing in my home that runs on 220 volts is the electric water heater and and there is a severe warning about about electric shock that can kill. Always check your component's set voltage. Too bad it wasn't switchable.

Ok. I can see clearly that you need some good advise, no one has done so, so I’ll jump in...
Before you remove the cover to see what fried, UNplug the receiver from the wall socket. 

Treat 220v with respect, it will kill you. Luckily you are not toast like the unit.
With different plugs and sockets across Europe for 220v I guess you went with two prongs, a live and neutral and no ground......not safe, especially when you unplugged the cable, had the breaker not tripped the cable could have melted in you hand. The breaker should have tripped immediately?