I wanted to chime back in this thread to say how impressed I am with the stock tubes in the LG.
Never in my life have I had a tube amp sound as good as the LG with the stock tubes. Edit for clarity: every amp that I personally heard, as configured with its stock tubes, didn't sound as good as the LG, as configured with its respective stock tubes.
In fact, even though I got my LG last year, I only put in the stock pair a few days ago after having lent out two of my vintage pairs to a fellow head-fi'er, and was getting the amp ready to ship back to Alex for the hum fix. Since he insisted that I ship the amp back with the stock tubes, I figured what the heck, while I'm at it let's give them a listen. My jaw dropped. Not because it was the best sound that I had ever heard (it wasn't), but because I didn't expect them to be that good. My expectation I guess was set pretty low by the combination of the LF with the stock JJ tubes, which was horrible by my taste. The LG, however, with stock tubes, is one exceptional sound machine.
One more edit, and that is to say that with a pair of Mullard CV-181 brown base British tubes, the LG/LCD-3 has provided the best dynamic sound that I have personally heard.
Edited by mwilson - 3/18/13 at 8:03pm