Well, I have knowledge with preamp tubes.. but not much about EL34s.

We're talking about current productions, unless you have a quite affordable NOS duets to suggest.

I'm currently running a pair of JJ E34L in my Laney, they have about 200 hours on them, but I'm running the MV only at ~3-4. No ear-crushing volumes...

I found the overall tone rather good (at least, better than the GT-6L6C that were in there initially!), but I think its missing some character now. So I'd like to have a few inputs regarding those JJ E34L, what you think about these. And what would be a great replacement. SED ?

Also planning to try out some Shuguang KT66 too. What should I expect ? Thicker mids ? More clean headroom ?

Thanks in advance!