This is a two part question. Can a 110v outlet be converted into a 220v outlet, yes it can. The other part of the question needs to be discussed.
Rewiring is easy
Rewiring what?
Redoing electrical wiring
earth your amp
plug all wires together.
If there is an INPUT connection, YES. If not it would be possible but would require some rewiring by an expert.If there is an INPUT connection, YES. If not it would be possible but would require some rewiring by an expert.
If you have some coils of wire and a house that needs rewiring, an electrician is needed to complete the job. He/she would also know if the wire you have is the correct wire to use in the rewiring.
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More cost effective to buy a new one.
Not without rewiring the lighting system.
dedicated memory is memory which is only connected to the GPU. changing shared memory to dedicated memory would involve rewiring the laptop, which would be far more expensive and far more effort than buying dozens of laptops with dedicated memory.
If this 'radio' is actually an audio receiver, with RCA inputs, no rewiring needed. simply purchase a 'Y' connector with a headphone jack on one end and RCA left/right on the other. This will allow you to output your iMac's sound into the receiver. If you're talking about an actual radio, i.e. something that does not accept RCA inputs, you could rewire it, but it wouldn't be easy. It would be easier to buy a set of amplified speakers.