SH-3 Stag Mag and The Mag surgery findings : opening it up

SoundAt11

New member
I'm a big fan of this series and have had a few Stag Mags and "The Mags" (flat Alnico 5 version that pre-dates the Stag Mag). I have an old MG-J Stag Mag that is pretty worn and decided to open it and and old MG-M "The Mag" to take a look.

Some findings:
4 maple spacers are what separates the coils from the baseplate. There are no other magnets, metal keeper bars, or anything. Here is a photo of the inside of "The Mag", which looks identical to the Stag Mag except for the rod length.
20140308_221007_resized.jpg
Both Coils are humbucker slug coils (I believe they use the JB wind, as the output is nearly the same and I believe one of the SD employees mentioned that here one time)
It uses 187 diameter rod magnets. Humbucker slugs are 189. Once you popped out magnets a few times and the wax is rubbed off, good luck keeping the magnets in place: the wax is key part in holding the rods in place.
The magnets are short (around a 1/3" to 1/2"), which is near impossible to find in a magnetized rod magnet. Usually, the magnets you can buy online are around 5/8" long. If you decide to do some magnet swapping, you'll need to flip the spacers upright so you have some additional height for the rods. "The Mag" has the spacers upright too and is a very tall humbucker as a result.
One coil is magnetically North and the other is magnetically South. On the Stag Mag/The Mag pickups, one coil attracts and one coil repels.
*bonus*
You could theoretically convert this humbucker to an all slug 'bucker by putting in 12 slugs (or Invander caps) and a magnet. I tried this and because of the coil wiring, one coil attracts and one repels my "test" bar magnet.

For the Stag Mag, my ultimate plan is to:
eliminate the magnet stagger by pushing them down even with the top of the coil.
swapping out a row of the Alnico 2 rods for Alnico 5 rods (so one coil is A5 and the other is A2).
Anyway, these are very cool pickups and are completely overlooked. I hope some other people might pick one up, play it, and start tweaking them!
 
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Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

One coil is magnetically North and the other is magnetically South. On my normal humbuckers, when I test them using a bar magnet, they all pull down on a bar magnet on both the slug and screw side. On the Stag Mag/The Mag pickups, one coil attracts and one coil repels.
*bonus*
I don't know about your testing results on standard humbuckers. Most have a bar magnet that straddles between the two coils and that results in North on one coil and South on the other.
The StagMag pole magnets are fitted to replicate this North / South arrangement.

I've played around with replacing bar magnets with pole magnets and doing things like having them all aligned north in both coils. It produces a different result especially depending on whether you connected the coils in series or paralell compared to N/S series/paralell.
 
Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

Thanks, I just went back and re-edited my original post. At 2AM when I wrote it, I wasn't thinking very clearly.
 
Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

The Stag Mag is a JB wind? Can any one confirm this? I always though it was two APS-1s stuck on a humbucker base plate.
 
Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

The Stag Mag is a JB wind? Can any one confirm this? I always though it was two APS-1s stuck on a humbucker base plate.

Definitely not APS-1's, The rumor has always been that its a JB wind but no one official will confirm it.
 
Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

interesting addendum:
I just measured resistance on "The Mag" : 14.75k
That really surprised me! This particular pickup is about 30 years old, so I wonder if the magnets are weakening.
However, more interesting: I have a beat up Stag Mag laying around. I swapped in slugs on one side, screws on the other, put in two maple spacers and a fresh Alnico 5 bar magnet: 16.k on the meter : right on spec for a JB. I'll try to wire it up later this week and confirm.
 
Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

interesting addendum:
I just measured resistance on "The Mag" : 14.75k
That really surprised me! This particular pickup is about 30 years old, so I wonder if the magnets are weakening.
However, more interesting: I have a beat up Stag Mag laying around. I swapped in slugs on one side, screws on the other, put in two maple spacers and a fresh Alnico 5 bar magnet: 16.k on the meter : right on spec for a JB. I'll try to wire it up later this week and confirm.


Ummmm the magnets make zero impact on the DC resistance. You can take the magnets out and still get a dc resistance reading.
14.75 would be low... what it means is that the wire used to wind it wasnt so consistent along its length
 
Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

Interesting thread I am considering Alnico 3's in my stag mag on one coil and lesaving the alnico 2's in the other. Might try a set of Alnico 5's as well, I found this site if it helps, they have .187 vintage Alnico 3's at .471" length and 5's at .531 lengths http://www.tone-kraft.com/alnico-3-rod-magnets-flat-top-187/ not sure if they come magnetized so am also looking for a deal on some Neo bar magnets to do the job if you have any recommendations How did your experimenting go? anyone recomend alnico 3's?
 
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Re: SH-3 Stag Mag and The Mag surgery findings : opening it up

Great post!!

Thanks for the experimenting and the informative investigation into the innards of the StagMag, and for the dimensions of the mag slugs.

swapping out a row of the Alnico 2 rods for Alnico 5 rods (so one coil is A5 and the other is A2).

That sounds like a great idea. When split to the A5 coil you should get some very spanky early Strat tones. I look forward to hearing your report.

Anyway, these are very cool pickups and are completely overlooked. I hope some other people might pick one up, play it, and start tweaking them!

I totally agree. I love the StagMag and could never understand either the lack of interest in this pup, or the dislikes and even hate directed toward it. The split sound is totally delicious and the series sound is actually very clear and articulate for a moderately high output bucker.

Thanks again, SoundAt11, for your report.
 
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