I was looking at other options of 274B tubes for the WA6/WA6SE. I was looking for some advice here from people who have had some experience. I got my WA6SE not long ago.! Comparisons would be greatly appreciated if possible. 274B tubes I was looking in to: Sophia Princess 274B (I have this one) EML 274B Jadis 274B Shuguang 274B Full Music Audio 274B Thanks a lot!