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Author Topic:  Is RW really neccessary in humbucking pickups?????
Denny Turner

 

From:
Oahu, Hawaii USA
Post  Posted 27 Aug 2007 7:46 pm    
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I would appreciate any info / enlightenment:

For the life of me I could never figure out why one coil in a humbucking set had to be reverse wound. It's always seemed to me that simply putting one coil mechanically out of phase with the other would put the signal back in phase which was put out of phase by opposite magnet polarity. I've occasionally made humbucking paired single coil pickups for about 35 years, never had to rewind one's coil in the reverse direction but simply reversed the magnets & the lead wires, ...and it seems to work just fine. I discussed this with Jason about 10 years ago, to which he quickly agreed ...as though he had already thought about it and came to the same conclusion.

Example: I have made several sets of humbucking-pairs of Danelectro lipstick pickups over the last 10 years or-so. With careful attention, old vintage lipstick cases "simply" slip off of the tape-bound coil-magnet assembly ...while the newer reissue pickups are wax potted and have to be heated to release the tubes for separation. Once the tape-bound coil-magnet "wad" is removed (slipped out), I just turn it over so it's bar magnet is opposite polarity facing up, then reassemble & reinstall the pickup AND WIRE THE LEAD'S COLOR CODE OPPOSITE the other pickup, like out of phase would otherwise be had I not flipped the magnet / coil over. This puts the modified / reversed-magnet pickup's coil / signal back in phase with it's stock humbucking partner ....imho.

Although reverse winding will indeed reverse the phase (and maintain output lead color code), simply reversing the leads without reverse winding seems to me to do the same thing in a lot easier manner. Did RWRP originally have some manufacturing benefit, and the term RWRP since-become so engrained that it is a marketing "neccessity" now; Or is there some electronic benefit that simply reversing the leads doesn't accomplish?

I have 2 theories about how the reverse winding idea came about; One of them might actually be an electronic reality or at least plausible electronic theory; While the other is a matter of manufacturing quality control Standard Operating Proceedure:

First, the quality control theory: If the coil is reverse wound, then the color coding of the leads could / would be the same, soldered onto each pickups' same SOP solder points. This would eliminate confusion over which pickup in the humbucking pair had to otherwise be wired opposite color code OR the color coded wires soldered onto opposite solder points. Murphy's Law suggests standard / SOP color code on all pickups solder points should eliminate confusion / brain farts / mistakes in factory assembly.

The second / electronic theory is that maybe there is indeed some benefit in the reverse winding that's not directly related to the simplicity of the AC signal motor that a pickup + strings is, ...a benefit / effect I haven't been able to find in 30 years or so of casual searching: MAYBE the reverse winding has some effect of cancelling some (unknown to me) antennae effect between the coils, ....some "bleed over" for a lack of better words; Maybe related to resonance, transformer sympathy, resonant or parallel antennae mass, etc.

I would be delighted to learn why reverse winding would be required or called for in one of a humbucking pair of single coil pickups as opposed to simply reversing the leads of one / either back into signal phase with it's partner.

Thank You.
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Denny T~
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Jack Stoner


From:
Kansas City, MO
Post  Posted 28 Aug 2007 2:27 am    
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If you have some time (maybe a lot) call Bill Lawrence and let him explain pickup and magnetic theory to you. If anyone knows it's Bill and he has been making "humbucker" pickups for many years, including pickup design when he worked for Gibson.
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Rick Aiello


From:
Berryville, VA USA
Post  Posted 28 Aug 2007 5:33 am    
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Quote:
but simply reversed the magnets & the lead wires, ...and it seems to work just fine.


That'll do it ... it's all about common mode rejection ... Laughing

I heard somewhere ... that Gibson's humbuckers were never "physically" reverse wound ...

Why do some pup guys "physically" reverse wind one coil ... ???

It may revolve around a particular pup maker's notions of which end of the coil should go to ground.

I've heard some pup guys say the innermost end of a coil should go to ground ...

Others say the outermost end should go to ground ...

If the unit is properly ground (magnets, slugs/screws, plates, etc ) ... it doesn't really matter which end of the coil goes to ground ...
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Denny Turner

 

From:
Oahu, Hawaii USA
Post  Posted 31 Aug 2007 11:05 pm    
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Thank You, Gentlemen.
_________________
Aloha,
Denny T~
http://www.dennysguitars.com/

Please help support humanity:
http://www.redcross.org/en/aboutus
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Denny Turner

 

From:
Oahu, Hawaii USA
Post  Posted 4 Sep 2007 9:53 pm    
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Thank You again.

Although it seems that the mechanical co-mode aspect is reasonbly settled:

Quote:
but simply reversed the magnets & the lead wires, ...and it seems to work just fine.

and:
Quote:
If the unit is properly ground (magnets, slugs/screws, plates, etc ) ... it doesn't really matter which end of the coil goes to ground ...

(...other than phase matching).

My curiosity won't rest wondering about the details (I haven't found) of opposing thinking of folks most likely smarter about the matters than I:
Quote:
some pup guys say the innermost end of a coil should go to ground ...

Others say the outermost end should go to ground ...


Oh-ver....... Confused
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Denny T~
http://www.dennysguitars.com/

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Rick Aiello


From:
Berryville, VA USA
Post  Posted 5 Sep 2007 4:49 am    
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Here's where alot of the "Boutique" winders hang out ...

http://music-electronics-forum.com/forumdisplay.php?f=11

I've commented there a couple times on horseshoe magnet stuff ... but they are a pretty "rough crowd" Whoa! ...

But it's fun to "lurk" and search for stuff.

Maybe your quest will end here ... buried in an achieved thread ... Mr. Green
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Denny Turner

 

From:
Oahu, Hawaii USA
Post  Posted 5 Sep 2007 6:00 am    
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Thanks Rick; I'll go dig there.

-------

Quote:
...they are a pretty "rough crowd"


Yea well, "boutique" carries some baggage; Not everyone can rise to such lofty ranks (very rank as we used to say in the fArmy). Rolling Eyes

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I wouldn't count on achievement from this end; My achievement luck has been a bit on the south side of null here lately ...but I can still smile about it. Smile
_________________
Aloha,
Denny T~
http://www.dennysguitars.com/

Please help support humanity:
http://www.redcross.org/en/aboutus
View user's profile Send private message Send e-mail Visit poster's website


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