Warwick Thumb Bass Pre-amp noise

[goingdownslow]

Haven't used my '90 Thumb Bass for a while and when trying it today, when I inserted the jack plug there was a static type electrical noise, like something being turned on, it lasts two to three seconds and then all is fine. It will do it again after removing and re-inserting the plug. It never used to do this and my other Thumb Bass, a '91, doesn't do it. A new battery doesn't help.

[paul_5]

Is it not just the capacitors/opamp filling up after being empty?

 

[Hellzero]

The output barrel jack may be loose (inside), as it's a typical problem with these.

 

Or it could be what @paul_5 said, so check after a few minutes of playing if it does that static noise again, if not, @paul_5 was correct, if it sill does, get a new barrel jack.

 

Buy these as even the expensive Switchcraft don't last (I've tried so many until I found these that last very long): https://www.amazon.co.uk/Alnicov-Stereo-Copper-Guitar-Cylinder/dp/B08L69K6QH/