12AU7s also reduce the gain a little. I ended up upgrading the the MkII preamp instead. A nice step above the original. The 12AU7s are a little soft in the use in the original 7.5.
I used Mullards with great success. I also used 5751s which reduced the gain just a touch but also sounded great. I am a big fan of Siemens tubes as well. I am using their ECC801s in my amps. The Teles get too expensive at times. I did try a few of the S teles but I was unlucky. Be careful & use a tube dealer.
I hope the 7.5 can handle the 12AT7 as it is setup for the 12AX7. You can use a 12AU7 but it changes the sound a little. But I would check w. VTL about the 12AT7. It might also be OK & sound amazing & just stick w. it.
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