Thanks for all the great info! The el34's are on their way so I will definitely give a full report. This Recto records VERY well... When doing metal type stuff, I tend to triple track the rhythms, but even the single track leads really sound interesting... I have a feeling I'm going to like the el34's, but probably not for long...
Also, the Rectifier Recording Preamp and Fifty/Fifty is spongy and thick and might be more so than the Rectoverb... so as mentioned above,Skoora, maybe if it is interesting enough, I leave in the el34's because the 'true' Rec sound might be covered by the Rec Pre (which, by the way, seems to have WAY more bass and sponginess and sparkle than the Rectoverb).
I'll keep you all posted... perhaps I'll record a short tune with the 6l6's and then the same one with the el34's... try to get the 'best' sound out of each... lean into where they want to go...