[Harp-L] A little help with wiring a volume pot

[Christopher B <s5gv2@xxxxxxxxxxxx>]

Hi All
    I am trying to build my self  a little volume control gizmo to go 
between my mic and amp as my mic has no volume control.
I have two female 1/4 inch plugs wire up to a volume pot- mic lead goes 
in one and the lead to the amp goes in the other. The problem starts 
when I try to lower the volume, the more I turn the volume down the 
louder my amp hums. So yes the gizmo works, it does lower the volume the 
but the hum makes it impossible to use.
   This is a learning experience for me, I know very little about 
electronics and the workings of mics,amps and related stuff, so I am 
probably missing quite simple.
   Can anyone offer any help?

Many Thanks
   Christopher B
      (cleverly disguised as a responsible adult)