What's the best sounding replacement for 12AX7A and 12AT7?

12AT7- Mullard Gold Pin (tough to find though- maybe ask Kevn at Upscale Audio)

In place of the 12AX7's you may want to find 5751's which are the mil. spec. version, old RCA's and Sylvania's.

Although both of the other suggestions above are excellent, great bass in a 12AT7 always makes me think Telefunken. From personal experience, the earlier Atmasphere circuits were transformed by the Tele's. I would be surprised if they did not work magic in your Jolida.