It will be different, but as for "better" that is hard to say. The change will depend on the EL-34 you choose and what you think of the sound. In very broad terms the sound should tighten up and emphasize the sound in the midrange and higher frequencies. The sound may become more detailed.
NOS EL-34s are really quite rare these days and very expensive. Which tube were you going to use?
NOS EL-34s are really quite rare these days and very expensive. Which tube were you going to use?