solid state amps matched with tube pre amp

Greetings,i just purchased a DeHavilland Ultra Verve preamp.It was a demo unit and im missing the page in the manual for start up and shut down,but was sent a ditto saying that the pre must be turned on first and the amp shut down first or serious damage to amp can happen.I usually leave my solid state amp on all the time.Is this the rule for tube preamps matched with ss amps.
thanks
Ant