Even the UREI 1620 owes a lot of its personality to its (distortion-introducing) output transformers. I actually put an old pair of them on my Soul Sonic discrete mixer and love the "muscle" of it.
I'm sure a Pioneer DJM mixer has vastly superior THD and Noise characteristics to all the stuff I
and I actually prefer the unbalanced outputs of the classic 1620,
to me it sounds less constricted, a bit more extension I suppose...
every body has their favorite flavor...