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RE: Question about matching tubes between phono pre-amp & headphone amp

Thanks, Mechans, for your further thoughts. According to Schiit, the Mjolnir II accepts both 6992 *and* 6DJ8s. They also indicate that the stock tubes can be swapped out "for anything in the 6DJ8, 6922, ECC88, and 2492 families," so hopefully that will broaden my choices. Right now I have installed Schiit's (stock) 6BZ7 tubes, which sound decent enough. But I have not yet compared them to anything else. But I'm still wondering, are the differences between the 6BZ7, 6DJ8, 6922, ECC88, and 2492 tube families merely formal/superficial, i.e. simply a difference of name/description? Or are there important structural differences between them which, while potentially significant sonically, nonetheless allow them to be completely interchangeable in an amp like the Mjolnir II?

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