Can you tube afficionados direct me to reputable, reliable sources for 6SN7 tubes? I want to try some different tubes in my Wyetech Opal Pre, to see how sound changes. Thank you.
Roger Modjeski at Music Reference/Ram Labs. He tests and matches all the tubes, and it makes a huge difference. They made my Atma-Sphere MA-1s sound so much better than other tubes.
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