Lamm L2 Reference tube recommendation

I'm not the only one that has one of these am I? ;-)

There is no substitute for the Russian 6C19P regulator(unfortunate, as the regulator of a tube pre-amp or power amp's power supply can yield much in the way of sonic improvement). The voltage reference tube(5651) can be found in a Raytheon, Sylvania, RCA, National, GE- but stick with the 5651 as it's voltage is 87 and the 5651A's(or WA) is 85.5. They are cheap enough($5 to $10 NOS) that you can try different ones to see if there's any difference in sound for fun. You might try a Mullard CV2573, and see if that lends a different flavor to the sound.

I have the L1 and the power supply has a similar tube complement, 12AX7, 6C19, 5651, but not 12AX3.
I have found that there can be small changes with different 5651's. See what you can find and give it a try.

thanks for the recommendations ;-) I'll give them a try.

Vladimir knows best how to voice his equipment and uses tubes speciific for that purpose. My advice is to go with what he uses as it works best in his gear.