There isn't much info at the Electra-Print site. But I'm sure Jack @ EP can give you the details.You can find out a little more @ Chris Beck's site. Follow the link attached.
What I know is this, The EP amp uses this as a phase splitter. It is a center tapped choke. Core is nickle. Very nice for low drive levels. Since your amp would not use it this way, the nickle core should be a nice touch.
Joe