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.

For 12ax7, try a 7058 (RCA made good ones). They are cheap and sound amazing.

For 12at7, try a GE or Sylvania 6201.

A very good tube equivalency resource is:

http://www.duncanamps.co.uk/

Talk with Andy Bowman at Vintage Tube Services (www.vintagetubeservices.com). This guy is the real deal! His supply, service, knowledge, testing expertise and equipment, and experience make you realize that all of the other so called "experts" really don't have a clue...and I've dealt with most of 'em.