I never include a standby switch if I build a tube head from scratch, but when I build out of a "donor amp"* that has one I keep it, because it's at least usefu

I never include a standby switch if I build a tube head from scratch, but when I build out of a "donor amp"* that has one I keep it, because it's at least useful as a mute switch. *Using a cheap tube amp from CL as the basis for a new build and tossing everything except the chassis and transformers, and maybe the sockets if they are chassis mounted, is a great way to build a great sounding tube amp on the cheap.