Tech 21 sansamp GT2 humming...


Hey guys i'm new here so excuse me if i have some spelling mistake...
So I made a trade on a Proco RAT II that i moded for early version 5 digits Tech 21 sansamp GT2.
and i do some changes on it:
I replace the power jack from 3.5mm positive DC input to a standard negative tip.
and replace the 100K linear potentiometer in the drive (cause the original do some whistling in 10 to 2 o'clock).
and now when the pedal is off i hear a noticeable noise and i guess it came from his buffer.
I'll be glad if someone will help me to solve that problem

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