Stacked P90 wiring

[tkachuk07]

I have a new guitar that is acting like a normal P90 guitar with 60 cycle hum. The pups are stacked P90's & I am curious if the wiring is incorrect causing them not to eliminate 60 cycle hum. Seymour Duncans wiring for their stacked P90 is not the same. SD has black & red to the terminal, green, white & bare to the pot.

The stock stacked p90 has a red & green coming from the top coil & the bottom coil has white & black leads. The red goes to the Volume pot terminal, black & bare to the top of the pot & green and white are taped together.

I know color codes don't matter, but do you see anything wrong in the stock wiring that would cause the pups not to hum cancel? It's definitely 60 cycle hum & actually is quiet in the middle position as if RWRP.

 

[uOpt]

Re: Stacked P90 wiring

This way the coils for the SD would be wired in parallel. Which might be what SD planned for it, but probably not.

It also looks like the polarity of one of the SD coils is reversed, so the blind coil adds hum instead of removing it.

 

[tkachuk07]

Re: Stacked P90 wiring

This way the coils for the SD would be wired in parallel. Which might be what SD planned for it, but probably not.

It also looks like the polarity of one of the SD coils is reversed, so the blind coil adds hum instead of removing it.

Thanks.. so the top ESP Stacked P90 is in series & looks OK, but the SD Stack P90 on bottom is in parallel & looks off.

All I can say is my guitar with the stock ESP Stacks does not cancel hum. The wiring I drew for SD is straight from their website wiring for the Stack P90.

Seymour Duncan P90 Stacks wiring
http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=p90_stacks

 

[uOpt]

Re: Stacked P90 wiring

Well according to that the SD stack is meant to be wired in parallel.

If you don't get hum-canceling you need to reverse the polarity of one of the coils, aka exchange green and red wire (or white and black) in the SD case. Also make sure you get a normal reading out of the multimeter from both coils.

 

[dystrust]

Re: Stacked P90 wiring

This way the coils for the SD would be wired in parallel. Which might be what SD planned for it, but probably not.

I no longer have the guitar, but I used to have a SD P-90 stack in a Tele. I tried it wired both ways, and it definitely sounds better in parallel. Not exactly true P-90 tone, but pretty close. Series OTOH was much too loud and very muddy.

 

[Funkfingers]

Re: Stacked P90 wiring

+1

The SD P90 Stack wiring instructions illustrate its default state as being wired in parallel. Switching between parallel, single coil or series interconnection is perfectly possible.

Series wiring does not bring as much volume boost as you might imagine.

Single coil mode reintroduces RF interference and hum.

Parallel mode is noise-free but lacks the "filthy gorgeous" tone and dynamics of a true single coil P90.

One idea that could be worth borrowing is Power Boost Wiring for Tele Lead Stack. Effectively, the two coils of the stack are reconfigured to act as one almighty single coil.

 

[Guitaraxz]

Re: Stacked P90 wiring

Try and reverse the red & green wires of your ESP P90.

Listen to DYSTRUST and try in parallel: red & white to terminal, all other to ground. If this creates hum reverse the red & green (green & white to terminal, all other to ground). EDIT: these colors are for ESP P90, not SD!!

 

[lewismatey]

Re: Stacked P90 wiring

I have a similiar problem , my Vintage V130 with a stacked p90 has 60 cycle hum ( Wilkinson WP-100 B ). The pup was wired the following way: Red&White connected , Black&Shielding connected to the top of the vol pot and green soldered to the volume pot's first terminal. The pots have been changed , I am asking if I should have the pickup wired like this

or some other way
I am enclosing a pics of the pickup itself

Red&Green are comming from the bottom coil , White&Black from the top coil ( shielding soldered to the baseplate)