What 6922's tubes are you using in your lamm s ?

While I don't own Lamm 2.1 or 1.1, I did own a Lamm LL2 Deluxe preamp, and I installed Mullard Blackburn 6922 with significant positive results.

I expect installing NOS 6922 from Siemens, Amperex or Mullard (depending on your preference) would yield similar results in the 2.1 or 1.1 amplifiers.

Amperex 6922 D-getters late 1950's all i can say is WOW!
The detail and soundstage is mindboggling vs the others.

Expensive yes but .....

The 2492 tube is a step above the 6922.For really premium sound I find the 2493 even superior.Be sure they are really Mullard and made prior to mid 1970.I have used both in my LL2 with outstanding results.Sorry no experience with the 1.1 or 2.1 but these should do the trick.
Enjoy