So if everything works by taking the Seb out of the equation then the problem is definitely with Seb I have never used one so just guessing
First are you letting the Pre's tubes warm up ? say 5 or more minutes ?
If so :::
#1 what about Bad tubes ???? is there any venting slots where you can see if the tube/s are glowing inside the pre amp (without having to take the cover off) ?
It is strange it really almost sounds like maybe the phantom power is not getting to the mic circuit But if the light is on then it should be ???
Have you tried a dynamic mic and see if you get any signal in the VU meter's ???
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