I suspect that the majority of the 7100's (and 200's, 770's, 755's, and 750's) in use are switched. I have heard similar start-up and shut-down comments, mainly regarding tube gear (thoughts from the toob guys? Soundhound?). Solid state amps may want a little warm-up time before you do any critical listening, but aside from that I wouldn't see a reason not to turn them off when they are not in use. As for cooling, it would probably be preferable to provide enough clearance to avoid needing a fan at all -- eliminate the noise. A cabinet that is open in the front (or better yet, open front and back) and a few inches clear above it should keep the 7100 happy.

------------------
gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review