Driving headphones with the Pleiades V6 1H4 microphone front end

Signal path: Enjoy the Silence - Depeche Mode on CD - Sony CD Walkmman at line out - Solartron laboratory step db attenuator - Pleiades V6 1H4 open grid Va=1.3V, Vb=12V, Altec input and output transformers = Sennheiser HD580. It sounds like a crystal palace of full bandwidth. Slow recovery of gain reduction (when overloaded) from limiting due to rectification effect due to open grid, distortion somewhat interesting.