pick up trick - OT but need to receive opinions/experiences

["luca" <lucafeed@tin.it>]

Hi guys,
I have finally received my new gtr, I have three Bartolini p.u. on it: 2
hum+1 s.c.
I have noticed a very strange thing: if i push any string nearer any p.u. i
hear a strange "scratch", like the one you can hear when you have pots
oxydated.
It is very low in volume, but i went checking it because something made me
looking for it.
I checked with my other gtrs, equipped with bardens or levinsons, but no 
one
of them has this behaviour.
I'd like to receive your opinions, maybe off list, if others are not
interested in this starnge thing.
Thanks in advance for your time.
luca