Re: el34
What are the words I am looking for here. IMO EL34's are warmer, smoother and rounder if you picture a distortion wave. 6L6's have a glassier edge to them, and are slightly more in your face. Perhaps the sound difference between an A2 mag like the APH II's and an A5 mag like the 59's, with the A2's being the EL34's, is a good comparison. Both great pickups, just different flavors.
Same with the tubes. I don't belive that a set of EL's will have the same glassy clean quality of a 6L6, especially when pushed a little. It's just different strokes for different folks.