Is it a Eminent II or Eminent II (T). The T-version is the one with with the solid state preamps. I think I have the the layout for both of them. Their mains transformers are different. Are you sure your transformer is dead? These Amps often have problems with the voltage selector switch. Dynacord/Germany might still supply spare parts. I´ve regulary ordered spare parts from them. If you are interested I could contact them.
Another source might be Welter Transformers/Germany.