Dunno, have you tried a google?
I have some excellent old books on the subject, also some copies of the old Elektor magazine articles, and circuit diagrams for the two monoblocks I built.
But atm they're buried away somewhere, I could dig them out and scan them if you're interested, but you may have to wait a few weeks.
I'm still looking for a decent preamp at a fair price, either valve or solid state, all I've ever used these things with is a Citronics Disco Mixer, but they sounded real good, and only 10 watts per ch.