rossipedia
Power User
I don't yet know about the Stealth 5150 III 6L6 vs EL43 model, but the original 5150 III 6L6 and EL34 models were more than just a tube swap: they had differences in the circuits, voicings, and gain levels. Ultimately the Blue channel on the EL34 model became love or hate because it was a much looser, tamer, and lower gain channel than on the 6L6 version.
As for the new EL34 Stealth, I haven't dug in yet to see if they made other voicing changes beyond the tubes.
Thanks for the explanation, TIL