I didn't have EL34s, but I went with JJ 6V6s tubes in my recto. I wouldn't limit yourself solely to the idea of EL's. That thing sounded so huge, warm, and raw once I made the switch to the 6V6s. It was so organic sounding that I thought that granola was going to shoot out the speaker cabs while foliage sprouted out of it. It was pure hormone-free, free range beef! It still retained the heaviness, it just lost some of the fizz and hi-fi-ness(?) of the standard recto sound. It isn't that I didn't like my recto before, but it was a whole 'nother beast with the new tubes. I loved it. Too bad I had to sell it...