Which do you think has more of an effect on changing the sound of an amp...changing to different models of speakers, or switching between tube brands? I have a Mesa DC-10 2x12 combo with JJ tubes throughout, and Eminence Swamp Thang speakers. The clean channel is perfect, but the lead channel just doesn't have that "bite" or "edge" that I hear in a lot of Mesas. I've talked with a bunch of tube vendors that have said the JJ's are taking the "bite" away, but I've also read that the Swamp Thangs can do that too. I've been thinking of either switching to 12AX7EH's and SED 6L6's, or changing to Celestion Century's. Which do you guys think would be more beneficial?