I velcroed in a little 3" computer type fan in the back of my Hayseed 30 head. It blows right across the EL84 and the needless to say, the amp runs MUCH cooler. Is there any tech reason that I shouldn't do this? Would it be better to have the fan output pointed away from the tubes? This is probably a stupid question but I just want to be sure as I really love this amp. Thanks in advance.