WSW equaliser 436 511

[PhantomBox]

Hi guys. I'm looking for the connection layout for a WSW equaliser. I rebuilt two of these years ago, but cannot find any documentation anymore. It is exactly like the one in the attached picture. If anyone knows this eq, please help...

 

[PhantomBox]

Today I received these EQs in physical. I remember now, years ago when I tried to rack them up together with other antique Quad Eight equipment, I ran into an issue. These units run on -24VDC, while the Quad Eights could run on +24 (up to +28VDC). With an non-symmetrical PSU, when connecting the WSWs with reversed polarity, they cancel each other out. Today I have a symmetrical PSU on hand and will try to connect then again. As soon as I receive a pair of connectors from a friend.
Still looking for the right connection pinout...