jibzilla
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National Union tubes are chameleons. They change pretty radically depending upon how they are biased and how many volts are on the plates. This is true of all tubes of course but in my experience the variation is usually not so pronounced.
With fewer volts they are the softest and most colored sounding 6SN7 I know, and not always in a good way. Run them harder and they come alive with strong dyamics and unusually aggressive attack for a 6SN7.
I saw you mention that you have never come across a neutral 6sn7. However what is your closest to neutral that you have heard?