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I can only compare the KT77s to 6L6s in my amp. I didn't get to really hear the EL34s in it, and haven't tried the E34Ls.
The KT77's, compared to 6L6s, have smoother highs, more mids(sorta "grindy"), and tight bass at about the same level.
I love them, they work perfectly for what I want.
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