Amp Internal Wire

Hi Gents, has anyone have any experience with upgrading amp or preamp internal signal wire? Most older equipment seems to have thin maybe sometimes poor internal wiring. In the world of OFC/OCC/Sterling and even more exotic wire available these days, any experiments done using this internally on components swapping out the cheap?

Lots of discussion about doing this with speakers, but never with components I've seen. For instance, I am thinking about replacing copper 'appliance' wire in an old Bryston with 14awg sterling from the board to the speaker binding post board.

Any thoughts?