Hey guys. I've got the flexibility of different power amp tubes in my Suhr PT100 head. I purchased a matched set of KT88 tubes, a set of EL84 tubes, and a set of Mullard EL34 replacements. I got the technical specs from Suhr to do the biasing. What I'm looking for is info on characteristics of these tubes. I've watched the YouTube vids and read all the forums I could. I guess I could just change them out, re-bias the amp and let me ears be my guide, but there's a lot of experience on here. The KT88 tubes have me intrigued, I think the changes from what I've read are what I'm looking for. Any comments or advice here?