Does anyone know if there's anywhere online that breaks down the different tubes and how they might be different or what their sound is broadly like? Not so much between manufacturers, and I know some are interchangable, but I'm talking about the tubes that are different enough that they require adapters. Like, what's the difference between a 6922, 6SN7, 12AX7, etc.
I'm sure there are tons of variables and subjective things here. But I'm a relative tube noob and looking to understand a bit more as I begin to explore more tube rolling.