Ok, gotcha. Get the SED's, don't get the SED's... Get the JJ's, don't get the JJs... By the way, are people talking about the JJ Tesla Blue Glass or something else? Also, Brent Jesse carries some of the SED's that are have been "burned in." Do you think this would be better to get to avoid bad tubes or is this a gimmick? EL34/6CA7 Winged C SED, new current production, Pre-burned in.MATCHED PAIR New production tubes! Very cool, very sweet sounding SED tubes from St. Petersburg, Russia that have been burned in for maximum stability and best tone! These tubes are smoother than most current production tubes, at a cost sure to please. You would pay much more for hand selected, custom pre-aged tubes like these if you could even find them! Carefully matched into pairs or quads.