the only electric hazzard you are creating is the possible transmission thumps/pops while the preamp is settling down. some of these could damage amps (unlikely but possible) or the speakers (quite possible). if your preamp has a mute switch that should take care of the problem - you would just activate it before shut down. as a practical matter, how long does it take your amp to warm up - most tube stuff takes from 20 minutes to an hour before you have optimal sound quality. unless you have an unusual amp, you could shut them both down and not lose much.
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