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The Svetlana EL34 is the perfect tube for classic rock. The midrange is very pronounced and the high end is smooth. The bottom end response is not the best, but in a guitar amp it becomes a moot point. In the test amp the mids just rip through the mix. No guitar player is going to get lost in the mix using these tubes. These tubes deliver incredible crunch making them perfect for that ZZ Top, old EVH sound. Seven string down-strokers may not be as pleased because they don't have that crushing bottom end. The Winged "C" SED EL34 tubes definitely have the advantage in bottom end but we find that it can get a bit boomy. For guitar players that need an EL34 tube and play classic rock music we don't think you can find a better tube than the Svetlana EL34.
If you are curious about how these fare in a hifi stereo amplifier be sure to read the Wall of Sound EL34 tube comparison for details