I'm having an argument with a classmate and we can't agree.
He tells me that it's not possible for the amplifier of a radio station to amplify the input signal "instantaneously" (at the speed of light), because they work with very big powers (tens of kilowatts) and you can't accelerate the electrons that quickly.
I insist that since it's an analog device, it will work at speed of light, and that you don't need to accelerate the individual electrons, but only the electric/magnetic fields.
So which one of us is right in this particular case? Is there a delay in amplifying a signal for a high powered radio station? The radio station part is important. He agrees for example that a typical home audio amplifier is instantaneously.
It would be great if you could provide a reference link for an answer (if possible). Wikipedia would be fine. But don't waste your time searching for one.