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original tubes for the Herron VTPH Phono preamp

Did the Herron VTPH phono preamp originally come with Sovtek 12ax7WA or 12ax7WB tubes and does one sound better than the other in the Herron? I suspect that the WB's have slighter higher gain but I'm not sure. Thanks
lornoah

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png2002
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Replace the 12AT7 with a Seimens ECC801S first. You will hear a lot more details after that. Then change out the first pair of 12AX7 with Mazda 12AX7 (If you can find them). They work well on both VTPH-1 and the brand new VTPH-2.
Enjoy,
Phillip
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