There are better tubes than JJ's---these were recomended on this site for my Amper jet ll
http://www.thetubestore.com/Tubes/Preferred-Series
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1933 Gibson L-00
2007 Taylor 110
2013 Taylor GS Mini
2018 Eastman E10M
1977 Sigma DR-9
2012 Republic Miniolian
2016 Recording King ROS-G9M
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