Pickup Rewinds

[kayakerca]

Anyone have any spec's (DCR) they would be willing to share for '56 Silvertone? Have a neck to rewind for one next week.

[mozz]

Thank you.

[big_teee]

Here's some Rewind Data for Jazz bass pickups.
Both pre CBS, and Post CBS.
My personal preference is to go low on the neck and high on the bridge.
This is stock type data.
T
**Edited the pre-cbs neck and bridge.
It took a while, the site kept crashing.

[big_teee]

1980 Dirty Fingers Pickup Rewind

I recently rewound a vintage Dirty Fingers, out of a 1980 Gibson Sonex-180.
The pickup uses 2- 49.2mm Era correct bobbins, the bobbins had no markings top or bottom.
The pickup was already modified for 4 wire cable.
The baseplate is the typical short leg Tim Shaw Era baseplate with same patent number on the rear.
The Cream bobbin was open.
I mic'd the wire at .00225-.0023".
The TPL was around 65-70 turns per layer.
The Large center magnet measured, 2.40"L x .440"W x .210"Thick, gauss was 1150.
The 2 outside magnets measured, 2.38"L x .255"W x .215"Thick, gauss of 1000 each.
The Black bobbin was Polarized South, the Cream bobbin was polarized North.
The Gauss at the top of the screws of each bobbin measured over 700 Gauss.
Which is really stout for a humbucker.
Wonder if the magnets are C5 or C8, the Gauss is less than C8s I've used?
Both bobbins were wound CCW, or Facing the Winder, using right arm, Top Going.
To get the little over 8K+ ohms DCR per bobbin, I used 7100 turns of Natural 44 SP wire.
Here are the before and after pictures.
The Data Layout, includes the mic'd measurements of the cream bobbin.

[big_teee]

Had a set of Zebra Dirty Fingers Humbuckers from a 1980 Gibson Sonex in the shop today from a local guitar technician. I'm guessing Dirty Fingers based on other stuff I've read.

Was asked to remove the original 2 X 1 conductor braided shield/ground wiring and replace with a 4 conduction, ground, foil shield setup.

Double Screw Bobbins with 3 Magnets per pickup (n-s, s-n, n-s). When I opened up the package, I hadn't realized there was going to be a copper shield layer around the set of coils.

Output P/U A:
Cream Side: 8.15kΩ
Black Side: 8.13kΩ

Output P/U B:
Cream Side: 7.93kΩ
Black Side: 8.4kΩ

The combined output for the original serial hookup was ~ 16.3kΩ as per above @ 74.4°F. To fit ~ 8kΩ on each bobbin, I'm guessing 44 gauge wire.

Just thought I'd pass along the spec's and some pic's for those that might be interested.

[ATTACH=CONFIG]31679[/ATTACH]
[ATTACH=CONFIG]31680[/ATTACH][ATTACH=CONFIG]31681[/ATTACH][ATTACH=CONFIG]31682[/ATTACH]

** I copied this post over here at the rewind thread, for a rewind informational record.
These have been popular lately.
I also presume the wire is 44.
wonder how many turns to get 8K ?
I calculate it to be around 7000 turns of 44?
Any additional rewind discussion would be great.
Has anyone actually rewound one of these?
The three magnets are also of interest.
T

[kayakerca]

Jim, are you sure that the bobbin height (winding area) was .250"- 1/4" ????
Thanks

It was definitely 1/4" (.250"). Outside to outside (top to bottom) of the bobbin was .3125", which leaves about leaves about .0625 for the combined thickness of the top and bottom flanges. Here's a shot I took of the profile after I had cleaned it up a bit. Very flimsy bobbin for sure.



Here's my wind sheet where you can see the bobbin height I sent the winder to for the various stages I wound it in.



I usually wind a few wire widths less than the bobbin height to get a more rounded looking coil wind.

[Stratz]

Jim, are you sure that the bobbin height (winding area) was .250"- 1/4" ????
Thanks

[kayakerca]

Bobbins can easily fit 5,000+ winds so 42 gauge single build is fine.

Yes, she held 5,000 of 42 SPN no problem.

[kayakerca]

Also, if you don't mind, please verify the bobbin dimensions.
We are always looking for real life dimensions.
T

The blade bobbin that was rewound was the junkiest looking piece of plastic. I understand the "thin" aspect to fit the mini format, but it looked like it was a larger bobbin cut down to size with a pair of scissors at the ends and along the sides. The flange was a fair bit narrower in the middle from being cut down so the wire was loose over the edges in the middle. Terrible bobbin as you can see from the image below.



Dimensions. . .
Length: 2.11"
Width: one end = .188" - other end = .195"
Height: .25"
Flange: .483" - .495" (depending on where you measured)

All back together and to the luthier.

[kayakerca]

Take notice on the direction it is wound & like the guys suggest mark the top & bottom , 6.8k would be a average working output for a mini . let us know how it turns out ..& tpl if you go in the coils.....

OH ya, if its more than a recoverable lead break on the finish end I'll definitely be taking a little time and care to squeeze all the tpl (turbo power licks) out of that coil!

[kayakerca]

42 gauge was standard from Gibson. At 6.8 it sounds like he's reading a working mini HB, It may be one of the newer abominations from Gibson. If so it could be either 43 or 44.

Yes, I've clarified with the luthier now. He recorded 6.8k on the pickup that was working, not the screw side coil of the broken one on its own.

[kayakerca]

Also, if you don't mind, please verify the bobbin dimensions.
We are always looking for real life dimensions.
T

Absolutely T.

[big_teee]

Also, if you don't mind, please verify the bobbin dimensions.
We are always looking for real life dimensions.
Another trick you might consider when winding?
Since the bobbin is open in the middle, I put a filler to keep the bobbin from compressing while winding.
If you mount with screws, you can put 3 small pieces of wood or plastic in the middle.
T

[big_teee]

Here's the estimated specs of a SD firebird 43.

[copperheadroads]

If only one coil is working then I agree 44gauge