They look almost identical but looking at the SD Antiquities they appear to be different pickups. Could a Jazzmaster pickup fit inside a soapbar cover?
This is a good description, very reflective of my experience with my JM and my SG with p90s. I'd add that when played clean, both have a warm fat sound to them, with the JM pickup having a unique high end kind of sparkle that I can't really describe well. Both pickups cover some similar ground but are still quite unique. In my experience it's not redundant having both.They aren't at all the same, so there's that. Don't be fooled by superficial appearances.
Jazzmasters are designed to be clear and warm, with great note articulation. They distort in a unique way.
P90s have a warm distortion and grind to them, very mid range sounding and whatnot.
Vintage design Jazzmaster pickups have a coil only 1/8" tall, compared to the height of a strat at about 7/16" tall. Having such a short coil limits the amount of wire you can get around the magnets. It takes a far wider coil for the same amount of turns on a more traditional design single coil like a Strat, Jaguar or Tele pickup. Wound to the same amount of turns, a Jazzmaster is 1.5" wide compared to a Strat at 9/16" wide. This means the coil wire travels at a greater distance on the Jazzmaster bobbin, resulting in more feet of wire per turn. The Jazzmaster dc resistance (in K-Ohms) reads much higher than a Strat, even though the output is very similar between the two designs. The Jazzmaster and Strat actually have a similar amount of turns and share a lot of similarities in design, yet they have quite different tone from each other. Wind a Jazzmaster and a Strat coil to the same amount of turns and the Jazzmaster will read about 8K ohms but the Strat will only read about 6.4K ohms. The frequency response is quite different but the output is actually about the same.
The Jazzmaster seems somewhat louder than a Strat pickup due to the increased bass and mids, but the extra fatness is somewhat misleading as far as the actual voltage produced. You'll notice the amount of distortion the amp produces is similar to running a Strat at the same volume level, whereas a pickup like a humbucker or P-90 will drive an amp a lot harder at the same volume setting. Japanese made Jazzmasters (CIJ models) have pickups made like Stratocasters and do not sound the same as vintage or American made models. These pickups use a standard Jazzmaster pickup cover but underneath is hiding the equivalent of a Stratocaster pickup. Another factor that affects tone is pole piece magnet length. The Jazzmaster magnets are only 1/2" tall compared to typical Strat pole piece magnets at about 5/8" tall. The shorter magnet has less power, so this softens up the treble response of the pickup
Im not saying they sound the same at all, most know that when you change the size of a pickup the sound is going to change alot, but what i meant was that i believe they are a very similar designThere is a recent thread here that contained a picture comparing an MIJ JM pup (which is basically a strat wind on a JM size bobbin) and a "real" aftermarket JM pup. It shows the difference between the two very clearly. They are nothing alike in terms of construction or sound.
Here it is:Im not saying they sound the same at all, most know that when you change the size of a pickup the sound is going to change alot, but what i meant was that i believe they are a very similar design
would love to see that pic though
I have one of these in the neck of my Reverend Slingshot. It actually mixes really well with the P-90 bridge, but as other posters have stated they are quite different.