Which didn't have any effect in the 2nd case.
or (if i'm in my rehearsal room) the field of the large toroidal transformer, not the 50 or 100 Hz hum.
[QUOTE]Which leads to a difference of the orientation of the compensation loops relative to the PUs: roughly 45° for Sharkfin and roughly 90° for the Primavera./QUOTE]
How this? Aren't the compensation loops in planes parallel to the PU coil planes?
The compensation loop produces "just noise", while the PU signal has a dominant frequency spectrum.
That's why i specualted on interference patterns.
Do you have an LCR meter?
Not quite clear from the picture: Is the controls' cavity shielded against electrical interference?
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