Tube Integrated in Home Theater?

I was wondering if anyone had any experience using a tube integrated amplifier in a combo 2ch/HT setup? I've been using a SS integrated (Plinius 8200) for a long time and while I love the sound I'm really craving tubes (probably go with VAC Avatar). My concern is whether the tubes will be able to handle constant switching on/off and looooong periods of use (8+ hours at a time)? I use this setup for everything including 2ch music, movies, parties, gaming, etc. I'm also concerned that tubes won't give me the "punch" required for movies. I listen to mostly classical, jazz and blues (SACD & RBCD) but also plenty of rock. Thanks!

My system: Von Schweikert VR4JR/LCR15/TS150/VRS1, Plinius 8200, Marantz SR8500, Sony S9000ES(2CH)/Marantz DV9500(MCH)