Small circulating fan to cool amps


I have two tube amps that are on a rack system with wood shelves. Because of the space requirements of all the components on the rack, there is not as much space as I'd like to see between the top of the amps and the under side of the shelve above. Although I have not had any problem to date, I'd like to make sure it stays that way. These amps do throw a fair amount of heat. Has anyone had any experience with a small fan that could be used for ventilation? I looked at Radio Shack and although they had a number of small fans, the smallest and lightest ones were 12v. I'd much prefer to run off wall current, but I don't have alot of space in which to situate the fan. Their non-battery fans were just too big and heavy. Any suggestions?
frankm1
Guess I read too fast. What kind of tube amps are they. I want to look at how the tubes are arranged.
I wasnt being a smartass, just pointing out he has tubes, but like you said, more info would be nice
If you have a 12v trigger on your pre, you can run a small PC type cooling fan directly off the trigger output. Check the current requirement of the fan against the current available on the trigger.
www.directron.com/quiet fans.html Then in search box type silencer. About half way down you'll see 8x8 ball bearing case fan 11.95. just above quiet fan shootout,read it ..i got 2 of these had a wall wart laying around ,went to radio shack,and got little black box for switch,put velcro on back of box and shelf to hang it ..so i can cut it off,,made a wooden fork like hanger to slide on back of self and mounted fans ..these fans a so great you cant here them run ever..read the shoot out ..greaest treak i know of for cooling..i set mine on my ps audio p 300 and it shays so cool befor it got hot even with there fan in it,shit works