Listed below is a link (Compares New production EL34 Tubes) that may be helpful with your selection process.
http://wallofsound.ca/audioreviews/tubes/el34-tube-comparison-with-tubes-supplied-by-www-thetubestor...
Also some further research on the new black diamond Telefunken, Psvane EL34 types, including the Black Treasures (see Grant Fidelity), and the Sophia EL34S (coke Bottle) may be of value to you.
As rsfphl stated, I also have found the JJ E34L to be an exceptional tube; Its a very high value tube. a quad can be found or approx. $65.00 per quad.
http://wallofsound.ca/audioreviews/tubes/el34-tube-comparison-with-tubes-supplied-by-www-thetubestor...
Also some further research on the new black diamond Telefunken, Psvane EL34 types, including the Black Treasures (see Grant Fidelity), and the Sophia EL34S (coke Bottle) may be of value to you.
As rsfphl stated, I also have found the JJ E34L to be an exceptional tube; Its a very high value tube. a quad can be found or approx. $65.00 per quad.