Try the Ilford datasheet, but that's for a Meopta colour head.

But this is the Meograde description

"Identical in size and specification to the Color 3 head, the Meograde head will replace the condenser head of any current Meopta black & white enlarger. A single filtration dial for contrast grades 0 to 5 (in half grade steps) has the advantage of retaining uniform exposure throughout the contrast range of VC black & white papers."