You've made the right choice with the start of your ubiquitous 9-pin miniature dual triode journey.   Just confirming the 12AX7 nomenclature is the US designation for the same tube that in Europe is known as the ECC83.   Sound signatures vary in valves made by different manufacturers both vintage and new. The critical question is what sound signature are you after, what genre of music do you like the most and in what role are the valves being used.   Just so you're
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