Has anyone tried other 6SN7s in a Freya? I ask because I have an amp which uses a 6SN7 driver tube. I have nearly 20 6SN7s and went through a long period of comparing them. The one I liked the least was the new Russian Tung-sol 6SN7. I like a lot of new re-issue tubes but not these. It sounded more constrained. My vintage Westinghouse, Sylvania, Hytron, etc., all sounded better.
In my case, my amp uses just 1 6SN7 so I don't have the issue of matching and it was relatively inexpensive to pick up a bunch of them to compare.
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