Are Lamm preamps hard on tubes?


I have a LP2 and an LL2.1 (purchased about 14 months ago) and my system is missing some of the sparkle lately. I'm wondering if the tubes (all purchased as NOS from Brent Jessee) could be wearing out? That would seem awfully quick for 6922 and 12AU7s right? Not sure about the 417As in the LP2. Any thoughts for anyone's experience with Lamm?
dhcod
Thank you @tomcy6 

That's not what this post was about. I have been buying from Brent forever and he's one of the best humans in the business.

Thanks to those who actually answered my question! Very helpful! Especially the part about cleaning the ears :)
Brent is pretty clear on his website about what "NOS" means and doesn't mean. (There is a tab on his page called "NOS Tube Specifications" that is worth reading).  Brent is a good guy and pleasant to deal with. 
There is a tab on his page called "NOS Tube Specifications" that is worth reading
Links are nice:
A BRIEF NOTE ABOUT NOS TUBES AND ORDERING INFORMATION (audiotubes.com)

Brent is a good guy and pleasant to deal with.
+10