gkr7007
Thanks for the thoughts. I think the issue is not having a clue what tubes would add a significant improvement. If tubes were, say, $10 each, I could burn through all kinds of configurations and have fun exploring the sound variations. I did read a blurb by the Lampi designer stating that many tubes sounded great in the Atlantic--a very all-encompassing but noncommitted statement. In forums, others have said they couldn't find any tubes radically better than those chosen to be issued from factory. But I haven't found anything that has expressed replacing "a" with exactly "b" will render a whole new world of music. In reviews by mag writers, several noted that they changed out the tubes but returned to the originals and found them more balanced. So it doesn't inspire confidence to tube roll. If anything, particularly in the PL case, it makes one want to a/b the entire unit with others... I'll end this by saying it does make a lot of sense as the tube influences the sound so much.