Madrigal cartridge loading?

I have an old Madrigal cartridge and I'm trying to learn the correct output voltage/cartridge loading for it.

Does anyone know the answer?

The second part of my question is- if my pre-preamp, a Tom Evans Micro Groove, is set for a 20-30 ohm loading and my Madrigal’s loading is different from that, will I be sacrificing audio quality when I run the Madrigal through the Micro Groove at the wrong loading?

Can you help me?

Thanks,