I've had another thought cross my mind (stop groaning!
)
The set gets nice and toasty just sitting on top of the cabinet; I don't know if I like the idea of enclosing it. I have plenty of PC fans in the parts bin; I thought to mount one just to get some air circulation over the tubes/power transformer.
I figure the best approach would be to tap the switched "phono motor" outlet with a small 12V wall wart to power the fan, and rig the fan to blow across the tubes and out the back (or vice versa- in the back and over the tubes).
Good idea?