I remember rolling GEC 6080s (which are nice) and then trying out a random Fivre 6SN7 I purchased. It was one of the most deepest and holographic sound stages I heard. I loved this combination until I burned out the tube by having the amp set to the incorrect voltage. Sad day and sold the amp after since I was too clumsy and burned out several expensive tubes, lol.
Distortion Profiles are a great way to look at it. I'm more or less out of the game, and rolled a ton of tubes (us/eu made) for years. Honest to god, never got into japan tubes at all in this time. Am rolling 12AT7, and tried this Toshiba with triple mica, D getters, and its one of the clearest/holographic tubes I've heard for this variant. Also, realizing, its insanely hard to find. It's insanely good though.
@Phantaminum I would be sad too if I burned a Fivre tube. Those are certainly ones that live up to the hype of holographic sound staging, among the best I've every owned. A secret hack to get that sound (is rare but out there) is to get Sylvania 6J5 tubes that are marked made in Italy. Those are actually Fivre tubes, and could get those for cheap/reasonable prices if one has sharp eyes for those details.
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