Mullard 12AX7 re-issue Cryo vs Non Cryo

Very interesting...

Thorman:

My control tube is the Ei and I really like it quite a lot. Have you heard this tube cryoed and non cryoed and what was the difference? I have both the grey plate and silver plate but really have not compared the two at length. If I were going to go with a cryo version, which would you suggest it be?

Markd:

Oh I might just bite the bullet and try the GT Mullard.. or should I read between the lines and try the NOS 5751 RCAs???

Very Interesting... Thank you all.

It seems that with the benefit of a few hours of burn the Cryo Mullard has settled in and portrays a more linear, more cohesive presentation. While it has lost a bit of it's mid treble presence, it is still detailed and transparent in this area.

It's a really nice counterpoint to the Ei, which I like enough to not even bother cryoing. It's the first and only time I would characterize "midrange warmth" as a positive attribute, having been put to sleep by Telefunkens in the past. The, Tele in my experience, is the one manufacturer of nos whose sonic signature is really quite all over the place, <> or not, depending on the vintage and specific model. Amperex, Siemens of this type you can set your clock by, but the the Tele takes an expert to really know what they are getting. I guess the fact that the Ei, ostensibly, is a Telefunken attests to not only the potential of this brand but the good taste and depth of knowledge the guys at Ei had.

I would like very much to hear the early Ei Grey Short Plate, especially if there was a EG version. Can anyone point me in the right direction?

Appreciatively...