is th gain on my phono preamp enough for MCoil?

My  tube phono preamp provides 52 db gain on the MC input.With the preamp switched on I do hear  a  very slight buzz/shhh  when the volume on my main integrated amp is in its normal 9-10 pm position. I assume this is circuit noise or just tube noise. When music is playing this is lost in  background but it does worry me since there is no complete silence on quiet passages.
My  shelter MC cartridge put out  0.5 mv. I am wondering if the gain of 52 db is enough since it means I cannot turn down the volume on the main amp to decrease the noise from the preamp. What to do since I like all my components.??