I've always loved the EL34 'sound' since owning an Audio Sterling ETSE and living with its syrupy midrange for a few years through Audio Note AZ-2's. A year or so back I borrowed a set of KT88's for my current Prima Luna but sadly didn't get on with them too well. OK so it was the power amp that didn't get on with them, I thought they were excellent and loved the sound. So in spite of my amp being 'compatible' with a whole host of power valves, every time I switched off the power amp I'd get a bloody crack through the speakers. Put the EL34's back in, perfect.