Supratex? I think they have those at Happy Hour at Chevy's don't they...?
Lets put this question to rest. My Cortese is at a friends house or I'd have replied by now with a photo.
I believe there are a total of 6 RCA inputs which can be any combination or function you choose including phono, CD, FM, HT bypass, etc. Also, a tape loop is available. The units have 2 RCA outputs and in addition, some may have one XLR output. Preamps without XLR outputs may have additional inputs or RCA outputs.
The whole thing is customizable to YOUR situation, needs, wants, etc.
On every Supratek I've owned, the inputs/outputs are all top to bottom:
Outputs are the same
The XLR's are also top to bottom.
The inputs are on the left and the outputs are on the right with the XLR's on the far right, followed by the DC power connector.
Hope this helps.