Duncan P-90 stack

[Gtr_tech]

I have a guitar in for repair (Gibby LP junior DC) that has had the bridge p-up replaced with a Duncan p-90 stacked humbucker. I can't ID the unit by the #s on the baseplate (IKT47-STK P1BP90 0367).
Coils 15K DCR each, Alnico magnets. Not a dummy coil arrangement.

The trouble with it is it is *extremely* noisy when series connected, and actually quieter when only one coil is used. ANyone have an idea what's going on here? MAybe this is an OEM unit, I dunno. Nothing matches any currently available model and I have nothing to tell the customer so far 'cause what I'm finding doesn't add up.

 

[big_black]

Re: Duncan P-90 stack

It's probably the P1 Stack, bridge model (model# STK-P1 p-90 stack).

As for the hum...I dunno, bad coil?

 

[Erlend_G]

Re: Duncan P-90 stack

Are you sure that you haven't done a bad ground somewhere?

EDIT: Or maybe there's a short in the internal wiring. It's 6:30 in the morning here, and my "bias is cold"

 

[Gtr_tech]

Re: Duncan P-90 stack

>It's probably the P1 Stack, bridge model (model# STK-P1 p-90 stack).

Nope. Coils are 15k *each* with a total DCR ot ~30k series connected. The P1 stk is 15k total DCR.

>Are you sure that you haven't done a bad ground somewhere?

>EDIT: Or maybe there's a short in the internal wiring. It's 6:30 in the >morning here, and my "bias is cold"

No need to be "so negative"
Actually I've redone the wiring completely with a star gnd scheme. I'm thinking the p-up is on the outs. I'd still like to know what it is tho.
AT any rate......its getting replaced. I'll save the magnets for a homebrew p-up.