How are you planning on getting the 24/96 upgrade? To my knowledge, that hasn't been offered since 2002-ish, since California Audio Labs has been out of business for several years.
As for the tubes, my favorites so far are the Sylvania 5751's. (It's a lower gain version of the 12AX7.) Not cheap, but definitely a big upgrade putting those tubes in.
Michael
As for the tubes, my favorites so far are the Sylvania 5751's. (It's a lower gain version of the 12AX7.) Not cheap, but definitely a big upgrade putting those tubes in.
Michael