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.