If your looking for a lower cost EL34 type, I can recommend the JJ E34L (not to get mixed up with the EL34)matched. There approx. $18.00 each at the Tube Store plus extra fee for matched and balanced. These were supplied with my Ars Sonus Filarmonia from the manufacture. I compared these to the KT77 (gold Lion tube) and found I liked these better. I also tried them in Primaluna Prologue 5 and P7 (Monos) amps and was impressed with the sound compared to the cost. Its like anything else, for the most part you get what you pay for, but I think its a great tube for the dollar. I can’t say how it will sound in your equipment. There are other options for a higher cost that I am hoping will improve the SQ of my system; maybe one of the Treasures, Psvane, RFT made for Siemens(RAM) or Sophia electric tubes, but since some are as much as $500.00 per quad, I am taking my time doing the research to be sure as much as possible that there worth the expenditure and do in fact provide better SQ
http://www.thetubestore.com/Tubes/EL34-6CA7-Tube-Types
http://www.thetubestore.com/Tubes/EL34-6CA7-Tube-Types