how do you do that though? the tubes continue to be warmed until you turn it off. EDIT ^oh i see. thanks. i don't usually turn down the volume before switching off the amp. maybe i should.
... turning volume to '0' keeps away unwanted future surprises and keeps pots healthy too. Best to work the pots ones a month by turning all pots from one end to the other and back again x5. This keeps em clean of crackle.