FWIW, I'm currently running a P25 with a Dynavector 17d2 MkII cart and have had no problems with hum (very low output mc).
Hum a problem with Planar 25/ Grado cartridge?
Disappointed with Planar 25/Elys combination. Dealer said cartridge needs break-in period of a couple of weeks. Have always preferred Grados but understand there to be a hum problem with this combination and not with the Rega cartridges. Ideas about Rega carts vs Grado and the hum?