| Can you post a clip of the popping sound? That would be helpful.
It could be a loose cable, or a terminal touching something it should not.
If you plug in your bass, with the control cavity lid removed... do you still have that popping sound? If you don't, then it may be that a cable is touching the shielded grounded (presumably) back of the lid momentarily.
Also, with the control cavity open and the bass plugged in, touch the cables and gently move them around to see if you can generate a pop that way (turn the volume of your amp just enough to hear that, no need to wake up the neighbours ;-). If you get pops that way then you have to check the connections systematically. It's easy for two cables to touch when the lid is closed if it's a busy circuitry. Maybe a cable is loose but not obvious by eye...
My first suspect is always the battery cable, and the terminal itself, which sometimes can be loose and a battery that sometimes breaks contact and then restores it will produce a popping sound.
It could be a connection in the preamp itself.
But I'd check the battery cable and the actual connector. They are the ones more likely to fail.
You said the output jack was resoldered... was that before or after you had this issue? At any rate, check that as you tightened the socket, it didn't turn so that a terminal could touch the shield or another terminal/cable. I've had issues with that too in the past. Depending on the type of socket, sometimes it's not obvious until you put a jack in it.
How did you find this problem? Did it happen overnight? Did you change anything in the electronics prior to that? Did it suffer a fall?
If the bass produces a normal sound (apart from the pops) I don't think the pickups will be bad. You seem to have checked things already, so I figure what I asked above will give negative results as you'd have noticed... but I have to ask, just in case.
It co
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