Seymour Duncan Jb Vs Jbj Vs Duncan Designed Hb-102 Tech Specs |
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Apr 14 2017, 05:41 PM
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This is my first test using my DIY pickup testing contraptions. I'm comparing the vintage Maricela Juarez wound JB (late 80s-early 90s), hereafter referred to as JBJ, with a modern Seymour Duncan JB and a Duncan Designed HB-102 (JB). I had hypothesized that they would all be technically the same, and I'm satisfied that they are with one caveat. The HB-102 has a nickel cover and I believe it is responsible for dropping the Q factor and flux density. The rest of the values are close enough for me to believe they're within production variances with little audible difference, which is also what my ears tell me. See this explanation:
"Generally speaking, when the resonant peak decreases in amplitude, which is to say, "the Q factor has dropped" or "the mountain has become shorter", it means the metallic component is imposing eddy current resistance upon the pickup, meaning the metal is conductive. Higher permeability will also increase the eddy current resistance, but it is only necessary that the metal be conductive. The more conductive and permeable the metal, the greater the eddy current resistance, and the shorter the mountain" will be. This is especially useful for testing the quality of cheap brass versus better nickel silver covers, and figuring out if an eBay seller has screwed you or not. Also note that any kind of series resistance in the circuit, and not just eddy current resistance, will also lower the Q factor. Resistance that is parallel to the pickup also lowers the Q factor, but in that case, a lower resistance lowers the Q factor, and higher resistance increases it." Here are the technical measurements I made: Resonant Frequency JBJ: 4.7kHz JB: 3.8kHz HB102: 4.6kHz Inductance JBJ: 9.98H JB: 10.58H HB102: 10.72H Capacitance (*calculated) JBJ: 113pF JB: 166pF HB102: 112pF DC Resistance JBJ: 15.8k JB: 16.3k HB102: 15.7k Flux Density: JBJ: 300-400 JB: 300-400 HB102: 250-350 Unloaded Resonant Frequencies  Seymour Duncan JBJ  Seymour Duncan JB  Duncan Designed HB-102 
This post has been edited by yoncopin: Apr 15 2017, 01:30 AM --------------------  |
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Apr 14 2017, 09:00 PM
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I find this comparision really interesting and I'm really curious to see this applied to more models. I personally use JB and I've compared it with Duncan designed pick ups. I can say that this graphic materialize what I was feeling when comparing both.
Keep this stuff coming! -------------------- My lessons
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Apr 14 2017, 10:38 PM
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Excellent thread!
Slightly tangential but pickup guru Ron Ellis discovered that the pickup manufacturers don't/didn't always check the actual alloy content in the magnets that they ordered, never mind copper content in the wire. And he found upon ordering a bunch of different alloy mags from different sources as well as checking existing pkups in guitars (vintage and modern) that their alloy content/ratio varied - sometimes wildly. In some instances there was actually no 'Co' (cobalt) in the alnico. Ron Ellis - https://www.google.com/search?q=ron+ellis+p...n+ellis+pickups Vid interview with Ron Ellis. It's a bit rambling. Skip to 18:11 - http://www.mylespaul.com/forums/showthread.php?t=370455 This post has been edited by klasaine: Apr 15 2017, 02:25 PM -------------------- - Ken Lasaine
https://soundcloud.com/klasaine2/foolin-the-clouds https://soundcloud.com/klasaine2/surfin-at-the-country-hop Soundcloud assorted ... https://soundcloud.com/klasaine3 New record ... http://www.cdbaby.com/cd/kenlasaine Solo Guitar ... https://www.youtube.com/playlist?list=PLXZh...5iIdO2tpgtj25Ke Stuff I'm on ... https://www.youtube.com/playlist?list=PLXZh...b-dhb-4B0KgRY-d |
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