I got an ADA MP-1 tube Pre-amp. It has two tubes. Now it seems to me that these particular tubes should be glowing a bit brighter than they are. Exactly how bright do tubes glow? Mine, I know have to be dim. I even let it warm up awhile but they got no brighter. You have to look very hard and close to tell if they are even glowing or not. I got this from some guy who I doubt ever changed the tubes. How often should I change the tubes? What brand should I go with? I think they are AX tubes not Ecc. I also have read that you can upgrade the MP-1 to four tubes. How easy is this? Would a guitar store do something like this if I find I can't do it myself? How much wood would a wood chuck chuck if a wood chuck would chuck wood? And who the hell was on the Grassy Knoll? :eek: Sorry for all the questions but this is a piece of kit I really want to get something out of. Any help much appreciated. :D