Here's the deal, my band is playing a little party gig this weekend and we'll be playing outside at night. Problem is, it's supposed to be in the low 40's/30's. I don't think it's gonna get that low until we're through playing, but I'm still a little worried about my tubes. Will they be fine as long as I give them time to get good and warm before playing, and give them plenty of time to cool off before loading the amp up? I do this anyway, but I just want to know if I should be worried about the cold or not. I know that doesn't seem cold to most of ya'll, but remember I live in the deep humid south where that's cold to us.