Sir do you mean that a tube amp w/ Tung Sol EL84 Power tubes will not sound different if plugged w/ a cheaper Sylvania or GE el84? Pardon me for the clarification sir newbie pa po sa tubes.
i wouldn't be looking for the differences, i will be more concerned with the whole system, "synergy".....
hearing is subjective, if you believe you can hear differences, there is a great chance you will...
the human brain is a wonderful creation, it is the sum of our experiences, beliefs and emotions, the hearing sensation is processed by our brains with these factors taken together.....
if i were you i will invest in a very good speaker, and then enjoy the music.....rather than think about EL84 types....the el84 is a very good sounding tube......