JJ EL34Ls are sort of a cross breed of 6l6s and el34s. They are more beefy in the low end while retaining that el34 mid bite. We put some EL34Ls in my buddies roadster and the results were pretty good. He's been gigging with them for the past 6 months running smoothly. So if you want the 34 sound with a lil more beef, then the 34ls are your tube.