Same turns, different DC resistance

[Kesh]

I just wound the two coils of a precision pup, 10,000 turns each, and one has DC resistance of 5.9K, the other 6.6K.

what gives? and should I care?

[Ward]

I just wound the two coils of a precision pup, 10,000 turns each, and one has DC resistance of 5.9K, the other 6.6K.

what gives? and should I care?

With your meter check for continuity between the outer mags and the start wire. If you get a reading you have a short to the mag. This will account for the drc oddity. Does it matter? to some it does, to others not. If you have no reading then you must have stretched the wire more on the 6.6k coil.

[copperheadroads]

Did you solder the leads then take readings ?

[Kesh]

There's no short, didn't expect there to be one as I taped the mags and sprayed lacquer.

The first coil has been soldered. It was maybe 5.95 before soldering, 5.93 after, the second is still on the winder.

I'm guessing I stretched it, or maybe my improvised turn counter messed up. Can't decide whether to take some wire off or just leave it.

It's my first wind, and I'm pretty pleased with not breaking the wire and not getting a dead pick up at the end, so meh.

[big_teee]

There's no short, didn't expect there to be one as I taped the mags and sprayed lacquer.

The first coil has been soldered. It was maybe 5.95 before soldering, 5.93 after, the second is still on the winder.

I'm guessing I stretched it, or maybe my improvised turn counter messed up. Can't decide whether to take some wire off or just leave it.

It's my first wind, and I'm pretty pleased with not breaking the wire and not getting a dead pick up at the end, so meh.

If it is a split P bass P/U, then figure where you want the hottest two strings and put the hot one there.
If I make another P set, I'm going to try making the P/U for the E & A a little taller than the D & G P/U, but not much taller.
T

[Ward]

There's no short, didn't expect there to be one as I taped the mags and sprayed lacquer.

The first coil has been soldered. It was maybe 5.95 before soldering, 5.93 after, the second is still on the winder.

I'm guessing I stretched it, or maybe my improvised turn counter messed up. Can't decide whether to take some wire off or just leave it.

It's my first wind, and I'm pretty pleased with not breaking the wire and not getting a dead pick up at the end, so meh.

Yeah, could be a bodgy counter???

[Kesh]

If it is a split P bass P/U, then figure where you want the hottest two strings and put the hot one there.
If I make another P set, I'm going to try making the P/U for the E & A a little taller than the D & G P/U, but not much taller.
T

I figure as hot = lower frequency response, I'd put the overwound one on EA. I could always lower it a tad if there's a volume mismatch.

[Stratz]

I'm guessing I stretched it, or maybe my improvised turn counter messed up.

That would be a hell of a lot of stretching.
Make sure you take your measurements after both pickups have been sitting at the same temperature for at least a few hours.

[Stratz]

With your meter check for continuity between the outer mags and the start wire. If you get a reading you have a short to the mag. This will account for the drc oddity. Does it matter? to some it does, to others not.

I have a "favorite" single coil in the neck position of one of my Strats that I wound ages ago. I know it's shorted from the finish end to one of the outer poles (it reads just a hair under the full DCR reading of the coil) and it sounds absolutely amazing.

Go figure.

[David King]

What counter sensor arrangement are you using? Were you winding faster on the second coil? Does the counter have a debounced setting for slower speeds?
I'd see if the current pair give you enough hum canceling but if these were mine I wouldn't hesitate to start over. I can't tell you off hand what a P coil at 10000 turns is supposed to measure but i don't think either measurement is out of the ballpark for 42AWG.

[big_teee]

What counter sensor arrangement are you using? Were you winding faster on the second coil? Does the counter have a debounced setting for slower speeds?
I'd see if the current pair give you enough hum canceling but if these were mine I wouldn't hesitate to start over. I can't tell you off hand what a P coil at 10000 turns is supposed to measure but i don't think either measurement is out of the ballpark for 42AWG.

According to the StewMac Instructions a 10000 turn coil should measure around 5.25k, and the pair should measure 10.5k dcr.
So you should be well in excess of 10000 turns if you used 42 AWG wire.
You should get more mids over the 10k Turns.
T

[Jim Shine]

Do you think the tension was consistent between the two?

[Ilya F.]

Do you can measure inductance on both coils? If they are realy consist same amount of winds, inductance are same on both coils.

[Kesh]

Well I scrapped the hot one, and wound another that came out just under 5.8.

Put them in my bass, and literally no noise at all. Amazing, especially when compared to the jazz pup at the bridge as a non-cancelling reference.

What counter sensor arrangement are you using? Were you winding faster on the second coil? Does the counter have a debounced setting for slower speeds?
I'd see if the current pair give you enough hum canceling but if these were mine I wouldn't hesitate to start over. I can't tell you off hand what a P coil at 10000 turns is supposed to measure but i don't think either measurement is out of the ballpark for 42AWG.

Magnet, reed switch, wired to calculator. Both at 400 rpm.

According to the StewMac Instructions a 10000 turn coil should measure around 5.25k, and the pair should measure 10.5k dcr.
So you should be well in excess of 10000 turns if you used 42 AWG wire.
You should get more mids over the 10k Turns.
T

I think that may be just a ball park. Magnet wire specs I've looked at say about +/-10% ohms. And temperature changes; I measured them when they were hot from potting and they'd jumped a lot.

Do you think the tension was consistent between the two?

I was using felt between fingers, so probably not.

Do you can measure inductance on both coils? If they are really consist same amount of winds, inductance are same on both coils.

I would be very interested in knowing how to do this. Seems I need a sine wave generator as well as my multimeter.

This is very much a made in my kitchen kind of project. By good fortune the pick up sounds great.

[Ilya F.]

I measure inductance with multimeter with this function. This is the simplest way to do it.
Different values ​​could happen because counter was missed turns, 400 rpm are too high speed for a calc. Some calculators do not have such a performance.

[Ward]

Yeah, calculator, reed switch

[Joe Gwinn]

I measure inductance with multimeter with this function. This is the simplest way to do it.

Be careful. Most multimeters cannot measure the inductance of a low Q (high resistance compared to the inductive reactance) inductor such as a guitar pickup, and give wildly wrong answers.

[Ilya F.]

I'm know it Inductance at different frequencies (100Hz, 1000 Hz, 10,000 Hz) are different values.
But if the coils are identical, they show approximately the same value inductance at any measured frequency.

[madialex]

Hey heres an idea, Were the TPL the exact same on both? If one had wider scatter its gonna read higher. Pickups 101.....

[Stratz]

Hey heres an idea, Were the TPL the exact same on both? If one had wider scatter its gonna read higher. Pickups 101.....

Any difference in scatter would change the TPL for any single traverse.

[David King]

I think the "problem" is almost certainly related to the counter missing some turns.
Glad the rewind got you consistent results and a great sounding pickup Kesh.