Klzdo -- the Lamm 2.2 is a hybrid amp containing a single tube, a specially selected 6922 triode, which is why I really doubt it's the tube. Still worth checking as I noted.
Gs5556 -- the Lamm 2.2 doesn't utilize tubes in the output stage. It's all-solid state, except for that single 6922.
Gs5556 -- the Lamm 2.2 doesn't utilize tubes in the output stage. It's all-solid state, except for that single 6922.