I have several pairs of ATC speakers, and you have nice ones.
would suggest a different pathway. The tubed BAT amp is not the best amp for these speakers- it won’t provide sufficient bass control. I would suggest the Schiit Wotan accompanied by the Schiit Freya+ with really good tubes. I’m running black glass Ken-Rad VT-231’s in the gain section and CBS-Hytron 5692’s in the buffer (this is about $750-$800 or so from someone like Brent Jessee for NOS). Awesome bass for a tube pream. Do not let others belittle this preamp- it’s very close to my Cary SLP05 with ultimate upgrade running similar premium NOS tubes.

