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Sophia EL34-ST Tubes

Does anyone have experience using Sophia EL34-ST tubes? Currently I'm using GL KT77 tubes in my Primaluna integrated amp. I tried other EL34 tubes along with KT88 and KT120 tubes but feel the KT77 have the smoothest mid-range especially with female vocals without sounding harsh. Supposedly the Sophia tubes have a 300B type sound from one review. Any opinions?
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Showing 2 responses by cellcbern

cellcbern's avatar
cellcbern
61 posts
 
In my Unison S6 they are a huge improvement over the Tung Sol EL34's that came with the amp.  Timbre, tonal and image density, soundstage - all improved over the stock tubes.  
cellcbern's avatar
cellcbern
61 posts
 
While the Sophia EL-34's were a huge improvement over the Tung Sol EL-34B's in my Unison S6, long term listening has revealed them to be too bright on some recordings.  I also tried the Gold Lion KT-77's and found them to be similarly bright while otherwise less impressive than the Sophia's.  Since the amp was voiced for EL-34's I have ordered the Psvane EL-34PH tubes (replica of the legendary metal base Phillips EL-34's) to try.

I will report what my listening experience is once they are broken in and I've had several months of listening to them. 
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