Dear @jmh128 : LOMC cartridges are not sensitive to load inpedance, are sensitive to inductance changes.
What normally happens is that in some phono stages when load impedance is changed exist/developed an electrical circuit between the phono stage: inductance, impedance and cartridge inductance and even capacitance and whom react to load impedance in reality is not the LOMC but the phono stage performance.
If the phono stage has a good circuits design then 100 ohms normally is the " rigth " value to go and forget to make changes.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
What normally happens is that in some phono stages when load impedance is changed exist/developed an electrical circuit between the phono stage: inductance, impedance and cartridge inductance and even capacitance and whom react to load impedance in reality is not the LOMC but the phono stage performance.
If the phono stage has a good circuits design then 100 ohms normally is the " rigth " value to go and forget to make changes.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.