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Recommended 12au7/5814s for Atma-sphere MP-3

I'm told these are the tubes that make the most difference in the MP-3; I have Sylvania 6sn7GTBs for those tubes in the unit. I think that how a tube sounds has a lot to do with the circuit that it is in, so I would like to hear from those that have rolled the 12au7 tubes in this particular unit; although I also welcome general comments on the 12au7/5814 breed. I have RCA Clear Tops, Siemens 5814s, RCA Black Plate 5814s, RFT 12au7, and RT 5814s, and Tungsol 5814s - I haven't started rolling yet; I have the Siemens in the unit and it seems to be very clear and spacious, but I'd like to know what other flavors I can expect with some alternatives. Thank you.
pubul57
pubul57 OP
3,712 posts
 
What makes a bigger difference, the 12au7s in the MP-3, or the VT-231/6sn7s in V1 of the M-60s? That is, which would you after first? I also read somewhere that VT-231/GTs were prone to microphonics compared with the GTA/Bs.
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pubul57 OP
3,712 posts
 
So what 6sn7s have you settled on for the MP-1? I'm using the early production Sylvania GTBs - stick with this and focus on the 12au7s? - I'll be looking for some Mullards based on comments so far.
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pubul57 OP
3,712 posts
 
Thanks Tvad. I'm going to give the Mullards a try (either CV4003 or 12au7).
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