Denon AU250 moving coil step up transformer. I bought this device to go with the Denon 103 cartridge I owned in the days when constantly fiddling with my hi-fi set up was a hobby. The AU-250 transformer has a 1:10 step-up ratio and input impedance of 40 ohm – pretty much the industry standard so should work with almost all MC cartridges. It has some very small, cosmetic signs of use. There used to be considerable debate in the hi-fi world about the comparative performance of step-up transformers and active devices and for some reviewers a transformer such as this produced the best analogue sounds: the AU250 was particularly well regarded for its midrange.

Denon AU250 moving coil step up transformer. I bought this device to go with the Denon 103 cartridge I owned in the days when constantly fiddling with my hi-fi set up was a hobby. The AU-250 transformer has a 1:10 step-up ratio and input impedance of 40 ohm – pretty much the industry standard so should work with almost all MC cartridges. It has some very small, cosmetic signs of use. There used to be considerable debate in the hi-fi world about the comparative performance of step-up transformers and active devices and for some reviewers a transformer such as this produced the best analogue sounds: the AU250 was particularly well regarded for its midrange.