So I listend to the video and it seems to me, as if the EL34 add some clarity and definition, clean played a bit more Treble, in the vintage Ch.2 the differences are weak. But in modern Ch.Red it sounds less compressed and more... I would call it lively! I cannot tell more about the low end. For this I must play that Beast by my own. Like the Video though. Now I would like to test EL 34 in my 2 Ch Rectifier. Which one you use inside the Amp in the video?