"Wild_Bill"
So, I've disassembled another Epiphone humbucker pickup of the same basic
type/series (but instead the neck pickup), and the Ringer Test results are
the same (4 rings whether assembled or disassembled).

Assembled pickup DC resistance 10.8k ohm, inductance 4.7H.

Disassembled pickup, coils separated from magnet, frame plate.. individual
coils inductance 2.3H

Bare coils, no screws or core plugs.. 830mH each.


** The number is visible cycles of ringing is a guide to the Q of a resonant
circuit - the Q is approximately equal to the number of cycles.

So, your pickup coil has about a Q of 4 - either bare or assembled.

Why?

The frequency of ringing is much higher when bare.

Q = the ratio of impedance to resistance at a given frequency.



..... Phil