Over the years I've tried EL34's from Svetlana, Harma, Sovtek and many others and simply put, these Electro Harmonix are my favourites.
The humble valve is surrounded by a lot of mystique and folk lore, most of which has little to do with tone or reliability. In a desperate attempt to get an edge over folks we're often sold custom matching or specially treated valves. The truth is that the great heroes of guitar stardom had none of these things, in fact their valves weren't even matched and their amps weren't biased. This is one of the core reasons why certain valve amps owned by our heroes became legendary (luck had favoured them accidentally with well matched tubes that happened by sheer wild chance to correctly match their amp's bias) but most amps just sounded just average or even poor.
In our attempts to reach the giddy heights of epic tone many of us (myself included) have reac hed out to the grail of esoteric custom matched valves and I have got to tell you... they were largely disapointing.
These Electro Harmonix EL34's however are another story. They are the sweetest sounding, most responsive, most 'real' and alive tubes I've ever played with. And they're the closest matched too, not to mention significantly cheaper than many others! If you're looking for genuine, honest, loud and proud tube tone these will not disappoint.