Border Patrol DAC tube change

I replace the EZ80 tube in my Border Patrol DAC SE USB+SPDIF with an EZ80 GE made in Great Britain.  The tube was made for GE by Mullard.  The improvements were significant.  The DAC now sounds more dynamic and the high frequencies improved.  My wife says its more lively.
I just received an email from Gary Dews (Border Patrol) saying that new tubes can calm down with use.  I will monitor the tube sound.
I had planned on doing the same thing but with a Mullard Square Getter which is known to be more punchy but no need for one now.

After 48 hours on tube, there has been little or no change in the dynamic, lively, and denser sound.

The EZ80 GE/Mullard tube used has a D getter.

From my experience with similar tubes, 50-70 hrs is when they come into their own but that's awesome to hear that a great Dac just went up another notch (es).

Just curious what equipment you are pairing with the Border Patrol?