[jhm731]

Look for a quad of EL34/6CA7 type tubes to try in my Leben CS 600, any recomendations?

[Ericus Rex]

I've had a number of current production EL34s, but in the end I settled on NOS Siemens.  They can be had for not too much dough.

[datman]

I recommend the JJ 6CA7. I have replaced my Treasures with them to a very positive effect. They take some time to break in, but reward with lucious, juicy, full bodied sound. They just sound like music.

[Indiansprings]

I like the Winged C or the Gold Lion KT-77

[jhm731]

I recommend the JJ 6CA7. I have replaced my Treasures with them to a very positive effect. They take some time to break in, but reward with lucious, juicy, full bodied sound. They just sound like music.

Just received a quad of the JJ 6CA7s, how many hours doesn't it take for them to open up?

[morganc]

I put a few hundred on mine and they are sounding great now in my Decware Tori. 

[carusoracer]

Keeps us posted on the JJ's I'm still on the fence?
I like my treasures yet always open to hear new tubes.
Good luck.

[trackball02]

I'm running a quad of JJ 6CA7 in my Van Alstine Ultravalve, replaced the stock EH tubes. They sound great. I did not regret the purchase. Besides, they are not that expensive. Check out Eurotubes.com.

[bunky]

i liked the Ei 6CA7, the Winged C EL34 and the GL KT77. the EH 6CA7 can be very good depending on the amplifier and delivers deeper bass than your typical EL34.