The best way to describe their "sound" is to say they just get out of the way and let the music come through like it was recorded.
I can totally agree with this,the mesh plate EML tubes bettered several other 2a3's that I used and they had a tone that was just right.
It has been a few yrs since I had my 2a3 amps and these tubes,moved on to speakers that simply needed more pwr at the time but I remember them well.
If I ever go back to a Set I think I will most definitely get another 2a3.
Best of luck,