Hum cancelling with a Phat Cat neck and JB bridge?

N

Nigel

New member
The two are in-phase in the middle position, but I'm still getting hum.

Are SD SH/TB-4 JB Humbuckers wound the same direction as SPH90-1n's?

I'm assuming I just need to swap the hot black and green grounds and I'm good to go, even when coil splitting too?

Thanks!
 
The best humbucking comes from an even number of coils with the closest match in output between them.
You have 3 coils.....so you won't get hum cancelling without the JB being split to the coil that is RWRP to the Phat cat. Even then you might find hum as the two coils will still be a bit mismatched in output.
 
AlexR said:
The best humbucking comes from an even number of coils with the closest match in output between them.
You have 3 coils.....so you won't get hum cancelling without the JB being split to the coil that is RWRP to the Phat cat. Even then you might find hum as the two coils will still be a bit mismatched in output.
Click to expand...

The phat cat is 8K, the JB split is 8.5K; pretty evenly matched.
 
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you should be able to get that to work but to be in phase and humcancelling, im not sure how it would need to be wired off the top of my head.
 
Same winding direction same polarity is in phase not hum cancelling, reverse wind reverse polarity is in phase and hum cancelling. So you have to flip the hot and ground leads to reverse the winding direction, then you have to flip the mag which will keep both pickups in phase and have the JB's split slug coil now be south. (PC neck is north.) Someone check me on this.
 
Setup the switch to connect red/white to black for splitting.

Or, white to hot, red to ground, black/red together to replace red/white.

Both should split to the opposite coil giving humcanceling.
 
Clint 55 said:
Keep the red and white to split and green to hot and black to ground.
Click to expand...

Why would you do that, now it’s out of phase with the other pickup.

EDIT - oh, because you are assuming a flipped magnet. If which coil os active doesn’t matter, just swap wiring. If which on is active does matter, you’d have to flip the magnet.
 
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If you only split to the other coil, won't it be same winding direction, opposite polarity?

Read all most posts, I also suggested a mag flip.
 
I want to keep the North slug coil as the split, so do I just swap black to ground and green to hot?
 
Clint 55 said:
If you only split to the other coil, won't it be same winding direction, opposite polarity?

Read all most posts, I also suggested a mag flip.
Click to expand...

So, opposite Mag polarity. Yes, technically the same winding direction but we wire it “backward” as standard practice. Splitting to the other coil will still be in phase but will also cancel hum.
 
Clint 55 said:
Yes, and you also have to flip the magnet.
Click to expand...

Okay. Mincer do you concur?
  • Leave RW/RP Phat Cat neck as-is.
  • Modify Bridge HB wiring as follows:
  1. Swap black (hot) to ground, green (ground) to hot, thus reversing the wiring.
  2. Leave white/red together.
  3. Flip the magnet so slug coil is now south/screw coil north.
Profit? Or do we need to change red and white? I sense the wiring directions of the HB coils need more inspection and articulation to clarify and complete the technical frame of reference to this operation.

Thanks guys, this forum has love. :)
 
Nigel said:
Okay. Mincer do you concur?
  • Leave RW/RP Phat Cat neck as-is.
  • Modify Bridge HB wiring as follows:
  1. Swap black (hot) to ground, green (ground) to hot, thus reversing the wiring.
  2. Leave white/red together.
  3. Flip the magnet so slug coil is now south/screw coil north.
Profit? Or do we need to change red and white? I sense the wiring directions of the HB coils need more inspection and articulation to clarify and complete the technical frame of reference to this operation.

Thanks guys, this forum has love. :)
Click to expand...

That will work if you need to keep the same coil active.
 
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