Resistor Value For Partial Tap?

[Chistopher]

So I've got a HH with a partial tap on the bridge in position 4. It uses a 3.3k resistor at the moment, but I find even this is too thin. Does anyone have any recommended values for a more of a tele sound on the bridge when split? Just as a side question, with a superswitch is it possible to change the value of the partial split on the bridge when in another position. I like the 3.3k resisitor when in position 4 (neck 2.2k and bridge 3.3k partial split, out of phase)?

 

[eclecticsynergy]

Re: Resistor Value For Partial Tap?

Not sure about using different resistors in different switch positions. But I get the feeling a superswitch might have enough extra poles depending on the complexity of your arrangement. There are several members here who are experts in wiring & switching configurations and have been immensely helpful to myself & others; I'll leave that to them.

As far as resistor value, I always recommend using a trimpot. That way you can tweak it to taste without tediously trying out a bunch of different values. (For guitars with pickguard-mounted wiring and no rear cavity, you can put it in the jackplate recess to make access more convenient.) When you have it exactly the way you want it, just close it up. A little foam or bubblewrap helps, to hold it in place and keep it from moving around. With a trimpot, you can easily readjust it in the future if you ever want to.

 

[Driverfrown]

Re: Resistor Value For Partial Tap?

https://forum.seymourduncan.com/showthread.php?273173-Partial-coil-tap-split-experience

 

[thanaton]

Re: Resistor Value For Partial Tap?

So I've got a HH with a partial tap on the bridge in position 4. It uses a 3.3k resistor at the moment, but I find even this is too thin. Does anyone have any recommended values for a more of a tele sound on the bridge when split? Just as a side question, with a superswitch is it possible to change the value of the partial split on the bridge when in another position. I like the 3.3k resisitor when in position 4 (neck 2.2k and bridge 3.3k partial split, out of phase)?

The value of the resistor depends on the resistance of the pickups. I suspect a value closer to 15k will work better. Just buy a 50k trim pot, and you can dial in a good resistance by ear.

 

[DavidRavenMoon]

Resistor Value For Partial Tap?

Instead of a resistor, try using a capacitor connected from the series connection to ground. This is an old Bill Lawrence trick. Try some values like .02 or .047 uF. The cap splits the pickup at a certain frequency. So in the low end it's still a humbucker, and in the high end it's a single coil. Beefs up the lows and still partially bucks the 60 Hz hum.


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[Chistopher]

Re: Resistor Value For Partial Tap?

A resistor is similar to a capacitor when used in a partial tap. As far as I can tell, the only difference is that capacitors only let certain frequencies below a point into the signal, whereas resistors have a steep slope compared to a capacitor's wall, if that makes any sense. And Thanaton, you think a 15k will work better? What about the neck, which is a Pearly Gates?

 

[vinnie1971]

Resistor Value For Partial Tap?

I use 4.7k on all my coil splits and it's pretty perfect


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[thanaton]

Re: Resistor Value For Partial Tap?

Instead of a resistor, try using a capacitor connected from the series connection to ground. This is an old Bill Lawrence trick. Try some values like .02 or .047 uF. The cap splits the pickup at a certain frequency. So in the low end it's still a humbucker, and in the high end it's a single coil. Beefs up the lows and still partially bucks the 60 Hz hum.


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It creates a band stop, literally a scooped response curve, similar in effect to a veratone. The tricky part is picking a capacitor, because the effect is very sensitive to the particular value. I like this mod myself, I'd suggest a person buy a box of assorted cap values to find the value the like the best.

 

[Chistopher]

Re: Resistor Value For Partial Tap?

So I'm considering sticking with the 2.2k and 3.3k for the out of phase but changing up to a 4.7k for a beefier split bridge. The last issue is seeing if you can change the resistor value on a superswitch, I'll let you know how it goes.

 

[vinnie1971]

Resistor Value For Partial Tap?

So I'm considering sticking with the 2.2k and 3.3k for the out of phase but changing up to a 4.7k for a beefier split bridge. The last issue is seeing if you can change the resistor value on a superswitch, I'll let you know how it goes.

I did dial a split where 4.7k was 0 and 10 was fully humbucking, essentially using the pot on a push pull as a volume knob for the cut coil - very effective

I also tried 10k for splitting and that sounds pretty much mid way between single coil and humbucking. I'd be interested to hear how putting them on a rotary cap goes. I bet you stick with the smaller values though, between 2 and 4.7k. I didn't like 10k so much. Too much of a compromise between single coil and humbuckers


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[Chistopher]

Re: Resistor Value For Partial Tap?

Thanks, I'm not going for too dramatic a change. Just beefing up the bridge a bit, so 3.3k to 4.7k shouldn't be too drastic.

 

[vinnie1971]

Re: Resistor Value For Partial Tap?

A resistor is similar to a capacitor when used in a partial tap. As far as I can tell, the only difference is that capacitors only let certain frequencies below a point into the signal, whereas resistors have a steep slope compared to a capacitor's wall, if that makes any sense. And Thanaton, you think a 15k will work better? What about the neck, which is a Pearly Gates?

A capacitor used for coil splitting is just like using a tone control rolled all the way back on the cut coil. I don't like it. It just sounds quite muddy and mushy. It sounds nothing like a single coil. The resistor method pretty much nails it. As long as it's very small. Make sure you split coils as follows:
Bridge - slug coil is active
Neck - screw coil is active

This will not only give hum cancelling in the middle position but the bridge won't be so thin and bright


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[pawleep]

Re: Resistor Value For Partial Tap?

how bout a 1000k pot in place of the resistor for a spin a split? on the neck of an h h?

 

[Clint 55]

Re: Resistor Value For Partial Tap?

No load 50k pots taper the most evenly for spin a splits I've found.

 

[Chistopher]

Re: Resistor Value For Partial Tap?

I've never liked spin a splits, they always seem to spend most of their time between 3 and 4, hence searching for a fixed resistor.

 

[zionstrat]

Re: Resistor Value For Partial Tap?

I've never liked spin a splits, they always seem to spend most of their time between 3 and 4, hence searching for a fixed resistor.

Agreed... Use a trim as others have said... On pickguard mounts I run long wires out of the cavity to test... Once I have the right setting I measure tp resistance and replace with resister... Or I super glue the tp so it won't turn, trim wires and put back in cavity.

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[PicoRiveraTele]

Re: Resistor Value For Partial Tap?

So I've got a HH with a partial tap on the bridge in position 4. It uses a 3.3k resistor at the moment, but I find even this is too thin. Does anyone have any recommended values for a more of a tele sound on the bridge when split? Just as a side question, with a superswitch is it possible to change the value of the partial split on the bridge when in another position. I like the 3.3k resisitor when in position 4 (neck 2.2k and bridge 3.3k partial split, out of phase)?

You should really just get a trim pot so you can set the value to whatever you like. I've found that 10k to 20k works well. You end up with a voltage divider between the resistor and the impedance of the split coil, so the effect for a given resistance will vary from pickup to pickup.

 

[vinnie1971]

Resistor Value For Partial Tap?

I have done many experiments on this and it depends on the symmetry of the coils, DCR and induction.

If your coils are assymetric split to the hotter one. If it’s the screw coil then you split by connecting to the series link to hot.

If the coils are symmetrical then ideally you want to get the humbucker to split to a reasonable DCR of a single coil.

So for an 8k PAF of symmetrical wind splitting the coils will give you an active coil of 4K which will sound pretty poor.

Remember that using a resistor it’s value is split across both coils so if you split via a 1k resistor that gives you a 4.5k active coil, 2k gives 5k active coil etc.

For an 8k PAF, 2k works well - the volume loss is not too much and the tone still sounds like a single coil.

When you try to bump the cut coil to strat single coil levels of DCR with 3k or 4K resistor then while the tone is beefed up and the output pretty much matches a single coil it starts to sound less like a single coil as the other coil starts to be heard. It’s like somewhere between a single coil and a filtertron or mini humbucker at this point. Above 4K and it’s hum is significantly reduced and it’s sounding more like a mini humbucker.

Above 4.7k it’s no longer got single coil voicing and starts to sound like a humbucker

Higher output humbuckers behave differently and do respond to larger size resistors before they sound like humbuckers - 12k I’d say 4.7 is a good value. But the higher the DCR the more noticeable volume drop unless you go with bigger risistors.

As a rule I’d go not much more than a 3rd of the overall humbucker DCR for the resistor value.
So 12k I’d go no more than 4.7k, for an 8k 2.5k is as big as I’d go.



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[Chistopher]

Re: Resistor Value For Partial Tap?

You should really just get a trim pot so you can set the value to whatever you like. I've found that 10k to 20k works well. You end up with a voltage divider between the resistor and the impedance of the split coil, so the effect for a given resistance will vary from pickup to pickup.

I did that at first, and I still use it when I'm using a pickup I'm not too familiar with, but I have found for the most part that pickups tend to work well with resistors that are somewhere between 25% and 50% of the pickups DCR, depending on what I'm going for and how the pickup is voiced of course. PRS recommends 1k1 for the neck and 2k2 for the bridge, but I find those results almost negligible to having not done it at all.

 

[pawleep]

Re: Resistor Value For Partial Tap?

The value of the resistor depends on the resistance of the pickups. I suspect a value closer to 15k will work better. Just buy a 50k trim pot, and you can dial in a good resistance by ear.

Am thinking of doing a dial a split with an HB103N, resistance is about 8.4k (wht to shield) and 8.26k (red - green) With taps (wht-red) tied (both coils in series i suppose) white to green measures 16.8k.
Have a 1000ohm and 2500ohm (ohmite pots) laying around i may try, or would a 50 or 100k be better?
Was pondering connecting the red-white taps to to center lugs of a DPDT (center off) and having one side of switch leg to ground and the other to a pot.
have no idea what sized pot to use yet. I already have a 1000ohm and 2500ohm i may try, But: from what i have been reading i may have to order a 50k or 100k to try
Any help appreciated