Humbucker Rewind

img_0461 Here is the offending Gibson Humbucker.  There is no resistance reading on the multimeter.
img_0462 After carefully sawing through the solder joints on the bottom of the pickup with a razor saw, the cover can be removed.  Here I have removed the four bobbin screws as well.  Dissassembly is fairly straight forward.  Here is a nice diagram of the humbucker assembly from the Stewart-MacDonald website for reference.
img_0464 Here is the pickup  cover removed revealing the pair of bobbins.
img_0465 Here are all of the wire connections exposed.  I always make notes about the connections for later reference.
img_0466 Here I have removed the bobbins and am measuring the resistance for each.  This bobbin is not damaged.  3.75k ohms is exactly what is expected from a Gibson Humbucker after 1965.  For more on Gibson Humbuckers see Vintage Guitars Info’s
Gibson PAF (Patent Applied For) Humbucker Pickup Info.
img_0467 Here is the problem bobbin.  No reading at all.
img_0469 Here I have rewound the damaged bobbin with 42 gauge wire to 5000 turns (Gibson Specs).  I taped the beginning lead to the arm of the pickup winder and turned the winder by hand until I could be sure the was enough tension to hold the wire while the machine was running.
img_0470 Here the very fine 42 gauge wire is wrapped around one of the wire leads for soldering.
img_0471 A little solder and heat melts the coating a solders the wire together.
img_0473 Here I have wrapped the joints in the same paper tape I will use to cover the windings.  This will help protect and insulate the joints.
img_0474 Here we have a reading on the newly rewound bobbin. Nearly perfect.  In fact maybe too perfect.   Some people prefer the tone of humbuckers that have the bobbins mismatched slightly.  I will carefully wrap the coil with paper pickup tape to protect the coils.
img_0478 Here the pickup has been reassembled and the connections have beens soldered and covered with heat shrink tubing.
img_0476 With all the connections together the reading is exactly what one would expect. 3.75k ohms from one bobbin and 3.77k from the other adds up to 7.57k ohms.
img_0479 All back together.  Heating the solder connections on the back of the pickup allows them to melt back together completing the assembly.
img_0481 Here I am wax potting the pickup.  While not always necessary it adds an extra layer of protection against microphonics.  The wax is a mix of 80% parafin and 20% beeswax which is heated in a double boiler to 140-150 degrees.  (Be careful if you do this.  A double boiler is necessary to keep the temperature under control.  Wax is flammable! )  After 10-15 minutes the wax should have penetrated all of the tiny gaps within the pickup and it can be removed.  It is easy to clean the excess wax off the cover while it is still hot.  Again, be careful not to burn yourself or your house down!

For a great video demonstration see this demonstration on YouTube by Searcy String Works.

For information about vintage Fender pickups seethe  Vintage Fender Guitar Pickup Spec Info

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