Step Up Transformer with Moving Iron Cartridge?

In addition to what Lew said, The LOMI carts still have appreciable inductance and the step up ratio needs to be kept low (generally under 10) to avoid issues at the top end of the audio band.  

dave

the key with LOMI and SUT's is the LC resonance gets to be too close to the top of the audio band for my liking.   assuming 2.75mHy and a 150pF load the 1:10 will reflect back 15nF which will resonate with the 2.75mHy @ 25kHz.  The typical 47kΩ load will go a long way to damp that resonant peak to something between 1-2dB which is actually a bit better than the 1-2dB drop @ 20kHZ from a simple 470Ω resistive load.

All of the above is simply the cartridge L resonating with the reflected capacitance and does not take into account the behavior if the SUT being thrown into the mix.

dave