Which Burson or Dexa did you get?

I have the original Minimax DAC and have read numerous reviews both pro and normal people (the most recent was Enjoy the Musics review of the Minimax DAC plus w/ various opamps both discreet and in chip form). One frustrating thing I've noticed is that nobody ever says which discreets they used! Both Dexa and Burson offer many of the same types (827s, 5534 etc) of opamps but for some reason no one says which ones they got whereas they seem to always say which type of DIP OPAMPS they got. Do the discreet people only offer one kind of opamp for the Minimax or what? Thanks.