If I had a Jadis preamp (which I could never afford) I would stay with the tubes the thing was designed to use. YOu can spend lots of money for nos 12AX7's but that's as far as I would go.
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Why not use the finest NOS ECC83 such as Telefunken or Siemens? Personally, I prefer the TFK ECC83 "Ribbed" plates. The rare & expensive TFK ECC803 is extraordinary in sonics and price but the ribbed ECC83 is exceptional in its' own right. Siemens E83CC is another winner.
Jim Ricketts/tmh audio