The tubes for my Mesa Boogie Lone Star Special arrived last week. I installed them and I instantly heard a dramatic difference. Truly remarkable.
Okay. Just kidding. Perhaps there is a difference in the sound but it is quite subtle. The amp sounds wonderful as always except that the microphonic noise has disappeared. I am playing this week-end so I will get a chance to give it a work out. I may notice some changes to the sound in a live setting. Or maybe the new tubes need some time to burn in.