Tube amp location

I have a similar problem, though slightly different. I have an open architecture rack, open on front, sides and rear. However, there is only about 3 inches of clearance from the shelf above it. No room for seperate amp stands, and this tube amp runs in Class A and throws off a lot of heat.
My wife and I both like the way it sounds, but I need to do something to cool the amp down. I've tried a few 120V fans, and found one that is fairly quiet. It can still be heard from 10 feet away when there is no music or quiet passages though. However, it does a great job of cooling.

I find the idea that the 12V fans may be even quieter to sound reasonable, but how would I run this on a 120V line? Would I need a step down transformer? Would I be better off just finding a variac to slow the fan I currently have a little more?

Also, do these 'tube cooler' items that I've seen selling really work? They seem kind of pricey, but if they drop the temperature significantly they may be worth it. Which are the best?

TIA,
John

John I have some small (5" ?) 120v fans made for electronic cases I got at an electronics store. Run full speed they were quite noisy from air flow. They also vibrated a tad as well. I got a 'varible fan speed control' at Home Depot which works very well, and I mounted the fans with glue and some soft rubber to prevent the vibrations. Very quiet results with reduced flow. I've never used 12v but the little (3"?) computer ones might be a bit noisy due to the amount of air they would have to move (if my conputer is any guide).

FWIW.

I've used Pearl tube coolers on a Cary V12i amp at one time. I really didn't notice that much difference when I removed them.

Thanks Newbee and Clio09. I didn't think tube coolers would make enoguh of a difference to make them worthwhile.
I will make a run to Home Depot to look for this 'variable fan speed control'. That sounds like what I would be looking for.

Thanks,
John