User Experience on Sophia Electric EL34 Tubes

I ordered a Quad of the EL-34st tubes this morning.  I'm not sure if there is an easy answer to this question, but why do these tubes sound so superior to regular EL-34's?  During a listening session yesterday, I swapped out the standard Mullard EL-34 tubes for the Sophia EL-34ST's.  With the Sophia tubes playing, the soundstage expanded to fill the entire room in front of us.  When we switched back to the Mullard tubes, the soundstage shrank to fit in between the speakers.  It sounded very flat and constricted after listening to the Sophia's.  Once you hear the Sophia EL-34's, there is no going back.  Just curious what you do different that makes the music sound so expansive.


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