I really like 7n7s, especially the older tall bottles.  I also really like the prices for 7n7s.  When asking for tall bottles, be sure to get old, original tall bottles.  I received one that appears to be a Soviet 6sn7 that was converted somehow to loctal.  While it is a very interesting tube, it doesn't sound as good as older Sylvania 7n7s, tall bottle or not.