Mark IV V1 NOS 12AX7 preferences

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kmanick

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So I got my mark IV back from mesa and all of the issues were addressed, but they sent it back with JJ's and a Tungsol RI in the PI
before I pull the chassis out and start tube rolling I'm wondering if people with experience have seen 'what works great , what doesn't"
I have these all available to me and these are my thoughts ( all NOS)
V1: I have a nice Mullard and an RCA 1950s long black plate square getter
V2: Amperex, Tungstram, RFT
V3: RFT , long plate GE
V4 ?
PI Sovtek LPS or Tungstram?

I also have a couple of early 2000 Sovtek 12AX7's, long plate GE's
a bunch of the desired 12AX7B square getter Chinese, JJ's from the early 2000's and new Tungsols , new Mullards and EHX

I know the standard response is "you need to try them" I'm just curious if anyone has had experience with any of
these tubes that really excel in certain positions , for instance the Sovtek LPS is a PI favorite, the Mullard will be great in V1 bit I've also read that people like the RCA in V1 as well
for different reasons.
thanks
Nick
 

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