I have around 100 hours on my Sophia EL34's and to my ears they sound better than my Gold Lion KT88's and KT77's and NOS Mullard xf2 or xf4 EL34'. The Sophia Electric EL34 tubes to me sound that much better from top to bottom. I liked the sound of the KT77's and the NOS Mullards of course but the Sophia's had that magic which just draws me in. If I had to pick an order it would be 1-Sophia 2-NOS Mullard 3-KT77 4-KT88. Thanks everyone.