Don't remember about the unblanced part, but I'm pretty sure the transformers were pulled. (as well as a bit of other parts)
I've mentioned this before, another major reason why that studio sounds so good is that the ins and outs of all machines go directly to XLR connectors, go under the floor, to where the other end of the wire is soldered directly to the output of the amps. No multipin connectors anywhere!
That one little principle I believe makes a major difference in the sonic path. And it's something almost everyone could do. It was a pain to change machines around, but thankfully that didn't happen that much. Even still, that's the way I'd do it were I to build a room like that.
In a related issue, anyone ever still do the mod to bypass the top electronics of the ATR 102? Another cheap, but very cool way to mod the machine. I've never seen one done here in Nashville. Used to see it done once in a while in LA.