A flux buster is a must when using MC cartridges, however there is another way that works just as well. Put a used Lp on the turntable with it turning and lower the tone arm. Then set the selector switch to a line stage your not using or if using make sure that component is off. Then remove the rca jacks from turntable to the preamp take the positive center plug and ground it to the other outer barrell of the RCA jack and hold it there for 45 seconds, repeat the process for the other RCA jack. reinstall the turntable jacks to the preamp and your done. Have used this for many years now and works like a champ. There is a video of this process on You Tube.