Silver is nice (we've built our amps and preamps on a custom basis with silver wire) but really all that's happening is that it seems to break-in faster than copper. If the copper is properly treated so that is does not corrode, its a better conductor than silver. But in most wiring that you encounter in audio (except perhaps in speaker cables) the difference in conductivity is not an issue. Compared side by side we really couldn't hear any difference between two of our amps one wired with silver and one with our own custom copper wire. We did hear a difference when the gear was initially built but after break-in it was gone.
I agree with this. Execution has a lot to do with it but that isn't the end-all of it either.
I don't think that any particular design feature is the be-all and end-all of amplifier design.
I agree with this. Execution has a lot to do with it but that isn't the end-all of it either.