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Sounds Like a Desireable Tapped SE Opt to VC or Line...

Posted by Interstage Tranny on July 31, 2012 at 15:39:36:
Typical CG series opts have separate line secondary and voice coil secondary. The VC windings will be labelled A thru C or D on the normal CG trannies. The Line winding taps will read a few dozen Ohms to possibly over 100 Ohms; the highest DCR would represent the 600 Ohm winding.

As I recall with these versatile SE opts, they have a tapped primary winding. Besides DCR readings, LCR readings wil help you sort this out. Without an LCR, you will need to perform some troubleshooting tests with voltages in and measuring the opt; but you knew that...Fidelity is reasonably good with this unit; if it's the one I recall...