REbbi,
Reading your historical info on teh blog, it may have been covered back then, don't recall but your Class D amp had only 10000K input impedance which is minimal and far from optimal for use with a tube pre-amp. FWWW, I'd be willing to bet if you were using it with teh Manley or most any tube pre-amp results might not be that great. COuld have impacted the OHMs easily if in the picture then, as might a lively room.
Reading your historical info on teh blog, it may have been covered back then, don't recall but your Class D amp had only 10000K input impedance which is minimal and far from optimal for use with a tube pre-amp. FWWW, I'd be willing to bet if you were using it with teh Manley or most any tube pre-amp results might not be that great. COuld have impacted the OHMs easily if in the picture then, as might a lively room.