I've recently bought another Jazz Bass set, which makes this my third or fourth set. I recorded technical values of those here . Fender Custom 60's Jazz Bass Bridge - DC Resistance: 7.35K ohms - Measured L: 2.837H - Calculated C: 183pF ( - 10) - Gauss: 1000G (AlNiCo 5) Neck - DC Resistance: 7.05K ohms - Measured L: 2.480H - Calculated C: 172pF - Gauss: 950G (AlNiCo 5) Bridge unloaded: dV: 14.8dB f: 6.89kHz (black) Bridge loaded (200k & 470pF): dV: 6.7dB f: 3.51kHz (blue) Neck unloaded: dV: 15.9dB f: 7.81kHz (red) Neck loaded (200k & 470pF): dV: 7.0dB f: 3.81kHz (green) This Fender Custom 60's set has less wire than the Pure Vintage 74 set, therefore lower inductance and increased treble response. With 470pF capacitance thrown in to represent a ~12 foot guitar cable, the Custom 60's have about 500Hz of additional reach into the upper 3kHz range. Both sets use AlNiCo 5 pole pieces. Fender also sells the "Yosemite" Jazz Bass set, which I haven't measured, but which I see uses AlNiCo 5 pole pieces also, and has DC resistances of 7.3k and 7.0k, which is exactly what I measured with the Custom 60's set, so it appears these pickups are more or less identical, aside from the hookup wire, and they cost about $30 less. There is also the Original Jazz Bass set, which cost less than the Yosemite set can have the nicer cloth hookup wire, too, except that this set features AlNiCo 2 magnets, and a bridge pickup with a DC resistance of 7.7k on the bridge, and 7.2k on the neck. AFAIK, Fender only used AlNiCo 3 some time in the early 50's, due to cobalt being expensive, possibly in relation to the Korean War, and I've never heard that they used AlNiCo 2 at all, so in the interest of achieving a good vintage Jazz Bass sound, I'd personally stick with pickups having AlNiCo 5 pole pieces. The reason I bought a new Jazz Bass pickup set is that a recent purchase came with stock ceramic pickups with steel pole pieces. Even though the DC resistance of stock steel poled ceramic pickups measured a DC resistance of 5.7k ohms, the highly permeable steel pole pieces in such pickups causes the inductance of the pickup to increase way beyond what it will be with AlNiCo pole pieces, so even though the pickup only reads a DC resistance of 5.7k, the frequency response with 470pF capacitance didn't even break 3kHz in testing, while the Fender PV '74 and Custom 60's both exceed 3kHz, despite having DC resistances in the 7k ohm range. This is true of all stock single coil pickups that have steel pole pieces; they are a lot darker and louder than their AlNiCo counterparts, even if the DC resistance shows that they have so much less wire on them. The steel pole pieces also causes eddy currents, robbing the single coil of a high resonant Q, that gives vintage Fender AlNiCo pickups a bite (some say ice pick) that they're well known for.