in my case, my pro amp has all the same qualities as a good audiophile amp, i.e. it is transparent and makes no hum or noise of any kind, except the fan which i hear only when there is no signal coming out of the speakers.
i thought about replacing the fan, but as i never hear it when something is playing, i thought it would not be worth the time and effort. also, this would most probably void the warranty.

mine is built like a tank and costs very little for it's output capacity.

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery