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In Reply to: RE: Question about matching tubes between phono pre-amp & headphone amp posted by Mechans on February 24, 2017 at 04:59:07
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?
Follow Ups:
I don't have any experience with the 6BZ7. It's name congers up an octal but obviously isn't one. Will you hear a difference if you roll the tubes? I certainly do in many cases, but not all circuits really permit that. Have you tried rolling some other tubes in other gear? what's been your experience with that? None of that tube family is warm IMHO, but try to get some used Mullard/Philips 6DJ8s, you might them.
No, I have not yet tried any different tube types in either my Bellari (phono stage) or the Schiit Mjolnir II, so I really can't be certain that my ears will hear whatever differences do exist, esp. if there is some other part of my audio gear that is weaker than needed to take full advantage of tube differences. But I am anxious to try out a Mullard -- such as the Philips 6DJ8 you mentioned -- as soon as the opportunity presents itself, and will report on the results (for whomever that might be of interest). Thanks again, Mechans, for your suggestions in that regard!
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