I tried new Tung Sol EL34B and found them very musical if not a bit midband forward. I think they needed more time to burn in but went back to my 7581A which are pretty much perfect. GT tubes are not great in audio gear. Gold Lion KT77 do have a solid rep but I've not heard them.
NOS EL34 becoming extinct
There is a thread running regarding whether tube gear is worth buying if one cannot find NOS tubes. I have been watching the prices of NOS EL34 soar and supplies diminish ( finding quads is quite challenging ). As my budget has shrunk as I retired I am thinking the unthinkable ; buying new production EL34. Tyranny for sure! WIth that being said I wonder has anyone found new production EL34 worth a try? Before diving down the NOS rabbit hole I had tried a quad of Groove Tube and was quite underwhelmed. As always your opinions are requested but please no snark.