Off topic, (but hey I didn't start it) while I prefer EL34 characteristics for what I like to play, I've had great and wonderful experiences with all the other power tube types; KT66, KT88, 6CA4, 5881, 6550. EL84 probably my least favorite, but I have a couple amps where they shine. The differences are subtle, break up point, slight EQ shifts maybe, etc. The circuit they are in has a lot to do with how they perform, so you can't just blame the tube. I have a Traynor YBA-1 that is merely 2 EL34 and theoretically only 45 watts (but probably 90 watts actual), but it has massive transformers in it and is so ear-piercingly loud and harsh when it's above 3 on the gain, I have to leave the room. Meanwhile a 2 KT66 JTM45 is one of the sweetest, clearest amps I have, with plenty of gain and no bad sounds anywhere on the dials.