If you ever hear true NOS Siemens or Telefunken, or Mullard EL34s, or for that matter NOS GE 6CA7s, you'll understand how woefully disappointing are the current faux "Tung-Sol", "Mullard" and various other iterations of this tube coming out of Russia. There are two excellent commercially-available alternatives:
1/ Shuguang Treasure 6CA7 - this sounds closest to the great vintage EL34s of anything in current production.
2/ Mesa Boogie, the guitar amplifier company, still has robustly-tested NOS Siemens EL34 in matched pairs for sale on their web site (go to the Store link). They are relableled Mesa, are genuine, and aren't going to last in their inventory indefinitely, so don't lollygag if you want them. They're worth it.
Phil
1/ Shuguang Treasure 6CA7 - this sounds closest to the great vintage EL34s of anything in current production.
2/ Mesa Boogie, the guitar amplifier company, still has robustly-tested NOS Siemens EL34 in matched pairs for sale on their web site (go to the Store link). They are relableled Mesa, are genuine, and aren't going to last in their inventory indefinitely, so don't lollygag if you want them. They're worth it.
Phil