Ruby el34s sound flat?

I thought the Teslas (JJ) were really sweet in my mini-monos. I have tried some KT88s but I went right back to the Teslas, I don't think I'll be looking for anything else, I'm way happy with the Teslas.

Thanx, Russ

Thanks for all of the responses. After playing them for about 30 hours I have grown to like them. The bass is definitely better than the Teslas ( more and tighter) but sound stage a little smaller and upper treble a bit muted but all in all very musical. I may try EHs next based on what I have heard.

I realize this is a very old post but I put some late 60's NOS Mullard EL34's in my Quicksilver Mid mono's that had the stock Tesla's in it.  There have been a few things that have got my attention when trying out new "so called" improvements to my system.  This was one of those "holy @#&*%" moments when I thought the price of those tubes was well worth it.  A VAST improvement.

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.

I agree with the results of that comparison the Gold Lion KT-77 is a flat out great sounding tube and good value I've been getting matched burned in quads from Tonal Tubes for $170 and free shipping. Beat the pants off the JJ 6ca7 and Winged C EL34s and PSvane Phillips EL34 replicas in my system my amp is a Deja Vu stereo pushpull wired in triode class A.