Spirit, converting any phono stage to 100K loading for vintage MM/MI cartridges is as simple as replacing the two or four 47K or 23.5K resistors located closest to input. Switching any remaining small-value load resistors in parallel with 100K will continue to load the input to the nominal value of the smaller resistors. While you're at it, you can further improve performance with a top quality resistor like Texas Components TX2575 or Caddock TF020.
Unlike all other MM/MI cartridges, the impedance characteristic of the low-output Stanton 980/981LZS is similar to a MC: it wants from 1K to 47K.
Unlike all other MM/MI cartridges, the impedance characteristic of the low-output Stanton 980/981LZS is similar to a MC: it wants from 1K to 47K.