Solid EL34 Tube
Similar to the Mullards, with a bit more edge. I have both Mullards and Preferred. I switched out the Mullards (very solid as well) to the Preferreds. Have not lost anything, as far as tone. We'll have to wait to see if they hold, up as well as, other tube choices in this class. The one thing I feel that they could be better is the price (More like the Mullard Price).