As with teejays experience the Micro ZOTL did sound a little better by itself even with my primo tubes but not by much. This contradicts my findings with my electrostats. In this set up the ZOTL40 and Micro ZOTL are inseparable and a match made in heaven. The ZOTL40 does not sound nearly as good without the MZ.
Now that the DI's are properly broken in I will put the AHB2 back in to hear the difference but being familiar with both amps I doubt the pairing will sound better than the beauty of the LTA tube amps.
Lance