 Kinman advertise their P-90 Hx as having a sonically transparent 600-Ohm hum sensor, which is remarkable considering the large amount of hum characteristic of P-90s.Finally, there is the Quiet Coil design by Mojotone, which focuses on the original size, parts, and materials found in vintage P-90s.The Quiet Coils strive to match the inductance and resonant peak frequency of a true single coil P-90 but without the hum.