Transformers are designed to work from a LOMC cartridges (10R impedance and less sources). Turns ratio is 1:16. Transformers are also great to work with (after) any type of current-output-type like DACs: ES90x8, AK4499, PCM56/58/63, PCM(DSD)1792/94, PCM1702/04, AD1860/62/65, TDA1540/41, TDA1543/45, CXD2552, DSC/DSC2_DAC_project and others WW shipment is included.