Right. Here's the dillyo. My rig is going to be used in the backline for a 14hour gig. We'll have at least 2 bass heads (and hope to have 2-3 cabs - 2 of which are mine). I've said that I'll let 5-7 of the bands use my rig (30min sets), and then we can change rigs mid gig. We're doing the same with the guitar amps. I'm using a valve pre/SS output. Now. I'm wondering: would it best best to change rigs every second or third band, or to use mine for the first half, then the other guy's rig for the 2nd half? Also, will using my cabs for long period of time bugger them? I suspect they'll be OK providing no one is driving them too hard, and I'll be keeping a close eye out. Should I perhaps take the amp out of the sleeve and take off the cover for better cooling between sets? Should I be switching the amp off between sets? (i suspect not due to the quick cooling down/heating up again from high current). I have a spare amp that is the same as my main, but as most of you know its a bit blah for vol output (mysterious fault!). I think if I really crank both gains on it it'll give enough output. I'm not to fussed if the "back up" blows tbh. So I could always switch heads after each band for my rig's alotment. My rig consists of a Trace Elliot mini stack: GP12SMX AH250 (250W RMS @ 4ohms) 2x10 200W (8ohm) 15" 200W (8ohm). Thoughts and advice?  gig is indoors and will have PA support.