humming phono stage

[rob]

i noticed a slight humming comming from my phono stage when my record player had the arm lifted off a record.
i unplugged the tt from my amp as well as its earth and the humming is still there.
i have to turn the amp volume up quite high to hear the humming but its in both chanels ( the amp and phono stage is dual mono design ) and its on mm and mc positions.
itds sounds like huuuuummmmmm then it moves up a notch and sounds HHHUUUUUUMMMMM then it gets quieter as if someones switching on and off a loudness switch.
is this normal?
do i need a seperate phono stage?

 

[sideshowbob]

Is it noticeable at normal listening volume with no music playing?

If not, it's probably nothing to worry about. Very few phono stages, even expensive ones, are completely silent at high volumes.

-- Ian

 

[rob]

nope , at normal volumes its quiet , it was just the hum switching on and off effect that worried me.