Which Lamm should I add to the flock?

Since a few 1.2 Ref. owners are on this thread, have any of you done any tube rolling? I just got a pair and was wondering if I should leave well enough alone or try some other tubes. Since there's only one 6922 per amp this shouldn't be too difficult. I'm almost new to the tube world and would appreciate anything you can share with me.
Thanks, Frank

I'm in the same position as Frank, so I would like to know your opinion on tube rolling the Lamms, too.

I have owned a lot of amps in over the past 33 years--most recently ARC Ref 600 Mk lll's at 600 wpc. I made an about face 6 months ago and sold them for Vladimir's ML 2.1 SET mono's at 18 wpc. I am using them to drive my Wilson X-2's. They do it with ease and plenty of headroom to spare. Having said this I can also comment that the ML 2.1's are the most musical amp I have ever owned. I don't see another amp purchase down the road even with Vladimir's upcoming mega amp the ML 3 SET which will have MSRP of $135K--rumored to be b/n 30 and 35 wpc.

As far a tube rolling I have recently bought 2 different pair of 12AX7's for the ML2.1's

I managed to get a pair of circa 1965 NOS Telefunken ECC83 with rib plates as well as circa 1957 Mullard's with long plate and square getter halo.

I was simply amazed at how different and much better the sound is comp[ared to the tubes supplied by Vladimir. The Telefunken's probably get the nod but the Mullard is also excellent--much warmer but not as much bass and less articulate.

Thanks Doc. I appreciate your input. The ML2.1's must sound wonderful. Don't know if I'll get simular results with just replacing one tube but I'm always looking for an improvement even if it's small. I was also thinking about the Telefunken's but don't know which one to try.

Elberoth2. If you find out anything specific to the M1.2Ref.'s please let me know.

Shure I will.