Tube question !! Post your opinions!

acappa

Alex Cappa TMF Studios
Hello everyone, the time for changing my XXX tubes has come. As you probably know Peavey XXX stardar tubes are: 4x 12AX7 Electro Harmonix and 4x 6L6 Ruby (in my case), right now I have: 3x ECC83 JJ and 1x ECC83s sovtek (phase) and 4x 6L6 JJ. Not really happy with the way it sounds, it´s like it sounded best before with Electro harmonix.
I play Thrash metal (the sound of the lastest Exodus albums/Kreator, not old school) and also Chimaira style, I´m tuned in Drop C.
So, which model/brand do you recommend??? 6L6/EL34...¿?
Thanks a lot!