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EAR Phono Classic / Phonobox tube rolling w/ 12AX7As

I've just purchased a pair of vintage 60s NOS RCA 12AX7A tubes to try in my phono pre. Mine is the MM only version w/o volume control and is fed from a Bob's Devices Sky 20 SUT. I'm wondering if anyone has tried 12AX7As in their EAR Phonobox / Phono Classic? If so did you find that V1,2&3 all need to have a high quality tube or is it more important in just 1 or 2 of the positions?
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128x128shawnwes
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jperry
2,448 posts
 

This thread might be helpful

https://forum.audiogon.com/discussions/which-12ax7-tubes-for-ear-834p-phono-stage?highlight=ear%2Bphono

shawnwes's avatar
shawnwes OP
35 posts
 

Thanks. Hadn't seen that. I did find an answer to my question elsewhere though. V1-2 should have the highest quality tubes & V3 is not as important so I'll try the NOS RCA 12AX7As in the V1-2 positions and use the EH 12AX7 in the V3. 

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