[TenTec] OMNI D Notch Filter Dual Potentiometer

[k7mks at comcast.net]

I need to replace this dual 250K notch filter pot and have a choice of an Audio or Log 









































































































































































I need to replace the dual 250K notch filter and have a choice of an audio or linear taper pot. Which is the correct taper to use in TT's notch circuit? 

Thank you joe k7mks