I'm guessing this has been discussed on numerous occasions already, but I wasn't able to find it anywhere on the forum even after extensive searching. My question is this:
Why are there typically not standby switches on headphone amplifiers using tubes?
A standby switch allows you to leave the plate voltage supply off while the tubes warm up, and then switch it "on" when you are ready to listen. This can extend the lifespans of the tubes by as much as 50%. I'm curious that I never see these on headphone amps. Anybody have any input?