Post by antigua on Sept 25, 2016 19:10:07 GMT -5
shop.fender.com/en-US/accessories/pickups/pure-vintage-65-strat-pickups/0992237000.html
I just measured this set because I was curious to see how they compared to the CS 69's www.strat-talk.com/threads/fender-cs-69-analysis-and-review.401765/
It turns out, the PV 65 is a "hotter" set. Both feature gray bottoms and red "enamel coated magnet wire". Both sets are new to within the past two years.
Fender Pure Vintage 65 - #1
DC Resistance: 6.03K
Inductance: 2.701 H
Resonant Peak: 8.38 kHz
Calculated C: 114pF (134-20)
Coil width: 0.545"
Fender Pure Vintage 65 - #2
DC Resistance: 6.25K
Inductance: 2.648 H
Resonant Peak: 8.08 kHz
Calculated C: 127pF (147-20)
Coil width: 0.53"
Fender Pure Vintage 65 - #3
DC Resistance: 6.04K
Inductance: 2.669 H
Resonant Peak: 8.36 kHz
Calculated C: 116pF (136-20)
Coil width: 0.56"
The pole pieces are AlNiCo 5.
The 2nd pickup is an outlier with respect to the coil capacitance, calculated from the resonant peak and inductance. The CS 69's show a higher calculated capacitance, by about 15 to 20pF. The CS 69's have much lower inductance, ~2.1 to ~2.6, as well has a lower DC resistance, around 600 ohms less, so it's clear that the CS 69's have a substantially lower wind count, but that the difference in capacitance ends up causing the peaks to be closer together than they would be otherwise. The difference in capacitance is a bit of a mystery, as the tightness of the coil seems to correspond with the differences in inductance and resistance. There's no reason to believe a difference in wind tension is to blame for the difference in capacitance.
All said and done, the loaded peak of the CS 69 was put at ~4.1kHz to the PV 65's ~3.8kHz, making the CS 69 set the brighter of the two. The Q factor seems to be about the same. The Q factor always seems to be the same; very near 1.8. I'm tempted to not bother with calculating the Q going forward, as it is a value that readily changes with the volume and tone pot tolerances, anyway. Humbuckers have a loaded Q that is too low to calculate based on the -3dB bandwidth difference.
I though Fender might have just re-purposed CS 69 stock as PV 65, but clearly that's not the case. I'm happy to find that I actually have two distinct sets up pickups here.
Setup details:
Bode plots are made with a Velleman PCSGU250 and the supplied probes in 10x mode, with the function generator feeding a driver coil of 0.48mH, placed on top of the pickup and driven with 2Vpp. The pickup is connected to an integrator circuit, designed by Ken Willmottkenwillmott.com/blog/, with a Velleman 10x probe, and fed back into the Velleman PCSGU250. I measured the probes' capacitance at 20pF, so that amount is subtracted from the capacitance calculation. The "loaded" tests have exactly 470k ohms and 200pF capacitance across the pickup.
The inductance and Q measurements are made with an Extech 380193 in "SER" series mode, and the mean value between the 1kHz and 120Hz modes is recorded. The capacitance value is derived from the inductance and measured resonant peak.
Magnets are tested with a Spin Doctor ERgravitastech.weebly.com/spin-doctor-er.html
