Sansui AU-a607 MOS Premium volume knob problem

jameswei

Super Member
I have a scratchy volume knob on my MOS Premium and I am trying to do a Dexoit on it, but can't get past the screw on the volume know. Anyone knows if it's a flat head or Phillips head? I can't see a thing and only try to fish around with a flat head with no success.
 
I think I got to find a small flashlight and hopefully, I can guess what is it, but the hole is just so small.
 
If it's like other Sansui knobs secured with an Allen set screw it will be something like 1.5mm or 1/16".
 
Got it opened and it's the smallest one that I have. I believe its 0.50. I spray some cleaners but the noise is still there when I am adjusting the volume. When I am not moving the knob the sound is fine, only when I change the volume level the noise is noticeable. Could the be something else? I try to upload some pictures but an error occurred saying the file is too large.
 
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