I don't try to avoid such thing. Generally I rest my thumb on the pickup but sometimes I do it on the very end of the fingerboard.
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I rested my thumb on the pickup for about 20 years of playing until I got a 5 string and had to learn the floating thumb technique. I’ve since sold my 5er and gone back to a 4 string bass but the floating thumb technique feel more natural to me; it takes the rigidity out of your hand and is overall more energy efficient

Exposed pole pieces or not?
How hard do you hit them?
How loud is the noise?
Tapping a pick on a PU is a standard test to see if it’s working/turned on.
This.
Is the PU completely stiff/immovable or does it move around?
Just had my Tobias 4 serviced & he replaced the 25yo foam under the pickups.
Where your thumb anchors, try sticking a pick in the gap btw the PU & the body, and rest your thumb on that (aka a reversible thumbrest). Might be a simple workaround for now.
Yeah after all these posts and not noticing the sound at my gig yesterday I suspect it could be a grounding issue. Unfortunately I live in an older apartment and probably can't change the wiring. But at least if I know it's not an issue at shows I don't have to worry about it.OP, are you noticing a pattern here?
It's not really a buzzing noise issue. More of an acoustic tapping noise.IMO you better solve the buzzing issue cos they may buzz when you touch them even if you are not resting your thumb.
Sounds like a grounding thing but its strange cos as far as i know bartolini have no exposed poll pieces.
This could be the cause of the noise-- it sounds like touching a pickup on an acoustic guitar (sort of a tapping sound). Not sure if its related to grounding or not. I didn't hear it in my gig though so maybe it's quiet enough not to matter when I'm in the mix.Bartolini pickups in my basses are a lower output pickup that’s been boosted, so they present like they’re slightly microphonic pickups. If you tap it hard enough it’ll reproduce that noise, like an acoustic.
Not to change the subject, but how do you like the Bartolinis? I have a couple of basses with them installed and to me they lack a bit of aggression that makes things pop. If you play them too easy, they make everything sound kinda loungy (I doubt this is a word, but you get what I'm saying... ) They are great for certain types of jazz though.This could be the cause of the noise-- it sounds like touching a pickup on an acoustic guitar (sort of a tapping sound). Not sure if its related to grounding or not. I didn't hear it in my gig though so maybe it's quiet enough not to matter when I'm in the mix.
Not to change the subject, but how do you like the Bartolinis? I have a couple of basses with them installed and to me they lack a bit of aggression that makes things pop. If you play them too easy, they make everything sound kinda loungy (I doubt this is a word, but you get what I'm saying... ) They are great for certain types of jazz though.