With most amps merely having them on will exercise the bias circuits and open the path through the amp's channel. But there is very little signal (just noise) passing through so all of the components in the signal path aren't being worked, especially the passive components. Even the power supply is just idling. I have always felt the best way to break in any component with capacitors is to put a cd on repeat, turn the volume down, and let it play continuously for several days. My system is in a basement listening room so I can do this without angering she who should not be angered. This is fun to do. Going down for a listen each evening reveals how the sound begins to relax and become effortless as caps begin to come in. IME, the caps are always the long pole in the break in process. Usually between 150 and 200 hours.
