I don't know what the dude with the Fender Champion was expecting, but I don't think a pre amp tube can distort one single string. Anyways... these are pre amp tubes, not power tubes... I might be wrong abut this, but as far as I know, the power tubes and their ratings are what dictates how early an amp breaks up or not... you can definitely push the pre amp tubes harder and create break up in just the pre amp tubes... But just the E string? mmm... I don't know but I found this tubes to really improve my tone and my amps ability to take pedals with a lot of bite!!! I still prefer Svetlana's or Tung Sol's , but these come in 3rd... better than JJ's and Groove Tubes in my opinion... I think it's a decent sounding pre amp tube... not perfect. But maybe JJ's would be a cheaper and overall "can't go wrong with JJ's kinda thing"
San Diego, Ca.