4002 pickup guts

[jdogric12]

First, I have to say I had a hilarious title for this thread that I withheld as it's probably not forum-appropriate, even if less than most would be hip enough to get it. If you're cool, you can pm me for it if you want a chuckle.

So about these guts... 4002 pickup guts, that is:


Here is what the guy who repaired them said:

There are two coils in this pickup wired in parallel resulting in the low ohm reading.

Each coil appears to be 5000 turns of 42 guage wire.

Both coils are magnetically the same phase but out of phase electrically.

This is not a problem as there will never be any cross talk between the strings.

Older Fender mustang basses were also done this way.

That's all there is is to them.

[cassius987]

Jason, this is sure to be a big deal to a lot of people. Including me. Thanks for taking the time.

Looking at it, you can see the potential "gap" in string coverage in the middle--I've heard some aggressive players lost signal by bending their strings too much on occasion and going outside the field of "vision". I've never experienced that problem myself.

[cjj]

Oh wow! Very cool indeed, especially for a techno-nerd like me...

[jps]

split coil humbucking pickups, so they are quite different from HB-1s in construction, as we have been told by those who know.

Now, that wants me to order the Nordstrand nj4sv pickups for my G&L JB-2 even more.

[cassius987]

Now, that wants me to order the Nordstrand nj4sv pickups for my G&L JB-2 even more.

I've only heard good things about those pickups.

[cjj]

So, what is the core of each coil? Is this a permanent magnet, or just a pole piece for a magnet under both coils?

[chrisdski]

split coil humbucking pickups, so they are quite different from HB-1s in construction, as we have been told by those who know.

Now, that wants me to order the Nordstrand nj4sv pickups for my G&L JB-2 even more.

Lindy Fralin makes a split coil humbucking jazz pickup also. I use them in my 74 jazz bass.

[jingle_jangle]

Jason, this is sure to be a big deal to a lot of people. Including me. Thanks for taking the time.

Looking at it, you can see the potential "gap" in string coverage in the middle--I've heard some aggressive players lost signal by bending their strings too much on occasion and going outside the field of "vision". I've never experienced that problem myself.

...which is why the Fender Mustang Bass/12 string pups are staggered. 2 coils=1 pickup.

[cassius987]

Same goes for the typical P Bass pickup right Paul? Except those are wired in series, I think.

[jps]

split coil humbucking pickups, so they are quite different from HB-1s in construction, as we have been told by those who know.

Now, that wants me to order the Nordstrand nj4sv pickups for my G&L JB-2 even more.

Lindy Fralin makes a split coil humbucking jazz pickup also. I use them in my 74 jazz bass.

I have been considering those, also.

[ajish4]

The LONG awaited mystery uncovered!

Thanks Jdog!

[iiipopes]

It's no mystery. Some years ago RIC still had an exploded diagram on their website, but it's not there anymore. Had I known at the time, I would have downloaded it. Moreover, anybody who has the traditional "paper with iron filings" to plot magnetic fields figured that out, like I did, several years ago.

Now, back to the top, even knowing what the construction is, it is great to see the details. I really wish RIC would make more 4002 pickups. This should really kill any urban myth left over. I am very glad to see the actual pictures of the insides. My surprise is that they are so accessible, if you're willing to drill the rivets, which were used instead of screws to hold the pickup together. I wondered if, like an HB-1, they might have been encased in epoxy. I never had the courage to drill the rivets, because I had no way of replacing them. But if you can, there is another use for them: replace 4003 neck pickup screws & nuts with the rivets so that the pickup can be adjusted closer to the strings for those that need that.

Hey jps: I have a split-coil Dimarzio UltraJazz in my custom fanned fret bass with the HB-1 in it -- how do you like the Lindy Fralin version?

And one correction to the above: if you take a separate magnet, you will see that the magnets are reversed from coil to coil as well, this is what makes them humbucking. Otherwise, you get a strange out of phase sound.

[cjj]

Moreover, anybody who has the traditional "paper with iron filings" to plot magnetic fields figured that out, like I did, several years ago.

Well, you would need to have a 4002 pickup too...


So, since you say that the magnets are reversed coil to coil (makes sense), are you saying that the cores for the coils are magnets? I couldn't tell from the pics whether they were pole pieces for magnets underneath, or the magnets themselves, but being actual magnets would make having opposite polarity much easier...

[jps]

Hey jps: I have a split-coil Dimarzio UltraJazz in my custom fanned fret bass with the HB-1 in it -- how do you like the Lindy Fralin version?

Scott, I haven't tried either the Fralins or Nordstrands, so far my impressions are from reading comments from others who have them in their basses. I am still in "research" mode.

[iiipopes]

So, since you say that the magnets are reversed coil to coil (makes sense), are you saying that the cores for the coils are magnets?

Yes. Note that the bass is solid, machined just enough to be a cradle for the coils, so there is nowhere for there to be a magnet under the coil.