will
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Sorry Drew. I am bad not to reload the page before posting, so I did not see your test method post before asking about the back switch. Glad you found a tube to test with.
In my first version of the ZRock2, with the tube mod only, I preferred 12AT7s for the most part, at least a very sonically balanced and resolving one I have, a particularly complete sounding old Mullard. After I fully modified the ZRock, fine tuned with faster, more transparent parts and wires, and some pretty complex cap bypassing... a 12AU7 is very resolving and plenty dynamic for me. 12AT7s are still more powerful, so bigger, denser and more vivid seeming... seductive for a while, but so far they seem to have moved into an overstated zone for me... in this system anyway.
May be a little different for yours, but on my ZRock2+ version unity gain is below 12 o'clock with a 12AT7, like 11ish, and with a 12AU7 around 1 o'clock give or take.
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