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PS will message you a little later re your pickups.
Formerly TheGuitarWeasel ... Oil City Pickups ... Oil City Blog 7 String.org profile and message
is this how Fralin does his hum-cancelling P90?
Adding another coil makes it hum cancelling ... that coil may share the same magnets ... as in a stacked humbucker. Stacked humbuckers are a very poor solution as the lower coil sits so far away from the strings that it adds practically no signal to the output of the top coil ... yet it must have substantially the same amount of turns of wire as the top one to cancel hum. This means you need twice the wire to produce the same output, and thus the 'drag' of the bottom coil ruins the tone of the pickup. Thus you need a almost a 20k stack to produce the same output as a 10k single coil ... with all the compression and lack of top end clarity that comes from all that wire.
Formerly TheGuitarWeasel ... Oil City Pickups ... Oil City Blog 7 String.org profile and message
Formerly TheGuitarWeasel ... Oil City Pickups ... Oil City Blog 7 String.org profile and message
Formerly TheGuitarWeasel ... Oil City Pickups ... Oil City Blog 7 String.org profile and message
Exactly this.
The Gibson P-100 and Duncan STKP-1 are constructed this way. Neither sounds right. The Duncan comes as standard with 4-con + shield cable, enabling series/single/parallel interconnection of the coils. Unfortunately, for the reasons described above by TGW, none of these modes sounds correct - not even when running just the upper coil.
It is possible persuade two narrow side-by-side coils under a P90 cover. Kinman and Lace have tried it. This arrangement does not sound like a conventional single coil P90 either.
One idea that I have never tried is to have a dummy coil, mounted low in the body, between two regular P90s. Again, I suspect, the resistance of the dummy coil will have negative effects on the sound from the pickups.
Another untried idea would be what Duncan calls Power Boost Wiring. i.e. Both coils of a P90 Stack, linked to become one enormous single coil.
In a war, would it be a bit of a Pig?
i guess I'll have to at some point just bite the bullet and live with the noise!
On some of their late Seventies exotic instruments, a guitar (or bass) would have large single coil pickups in the bridge and neck positions then, a smaller dummy coil positioned halfway between.
To put it another way: If you have 10,000 turns (the average for a P90) you will have to add a significant percentage of extra turns on a dummy coil to make the combo hum canceling ... Say for example 8000 turns ... you in effect have an 18,000 turn humbucker. The average PAF is 10,000 or so turns ... so your 18,000 turn dummy coil humbucker has the mushy tonal characteristics of a super hot humbucker yet only the actual output of a standard P90.
You can't buck physics, extra wire equals a tone change ... full stop.
Formerly TheGuitarWeasel ... Oil City Pickups ... Oil City Blog 7 String.org profile and message
I wasn't.
My "academic interest" question, directed at TGW, was a crude attempt to extract a semi-scientific explanation for why P90 goodness and dual coil noise-cancellation are mutually exclusive. Hopefully, his answer will help some reader in future.
C. Y. T.