I've been putting some hours on my Triode ST70 kit with 4 Svet EL34 tubes and the EF86 board with a Webber copper cap. It sounds pretty good (even without a preamp), but I've noticed that the power transformer heats up quite a bit after about 1.5-2 hours of run time (if I had to guess, it seems to get up to around 100-110 degrees F, just under the threshold of pain). I'm not sure if this is normal, as this is my first tube power amp, so should I be concerned with the temps this thing is putting out? I try to leave the celing fan on in the room where I use it, but that seems kind of cheesy to me.
I've also been considering swapping the EL34s out for KT88s. What exactly would I need to do to accomplish this (if I can do it at all), and do I really stand anything to gain enough to justify the purchase of the tubes?
Thanks in advance!