Ive worked on one. they are pretty cool in general but there were lots of options for that board, so all consoles were not created equal.
you could get it with either a transformerless micamp or one that had a jensen transformer and the sony hybrid. both are clean, decent preamps.
there were 3 different EQs IIRC. I used the fully parametric version. it is ok, nothing special IMO. I always wondered about the optional EQs though. one of them I believe used inductors in the mids/low bands. mechanical push-switches to select frequency.
there is a VCA on each large fader path. if you flip and mix with the (rotary) small fader it sounds a little better to me. not convienent though. but for returns, and stuff you really want to shine, like lead vocals or whatever, try it. to complicate matters, there were 3 (IIRC) different VCAs that could be in there. dbx stack-o-sips jobbie, valley-people module or something else.
you are well served to patch in an outboard monitor controller or mod it in this regard. Fred Forssell was making replacement modules for these baords, not sure if he still is. If anything, id replace/mod the master/cntrl room monitor module.
mike p