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Post by garyh on Apr 20, 2006 13:44:11 GMT -7
I have a 1960 P-90 and I want to check its impedance. I have a volt meter but how do I do that? I've put the probes everywhere (with it set to R X 1K ohm) but either get zero or nothing (no pun intended!).
Any help would be appreciated.
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robt
Full Member
Posts: 138
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Post by robt on Apr 20, 2006 14:52:19 GMT -7
Gary, I'm certainly not an expert. If the meter is set to read ohms, touch the red probe to the core wire (inside) and black probe to the outside or to the metal frame to reach ground. If you don't get any reading, the coil may be dead from a broken wind. There is a guy in St Louis--Skip Goez--who rewinds pickups. He's been in the business a long time, is a local legend, worked on Clapton's original Blackie (twice), refretted Albert King's V, etc. You can call him at 314/647-1211. He's one of the guys that Fender refers people to. Good luck.
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Post by garyh on Apr 20, 2006 15:35:07 GMT -7
Thanks robt. I get no reading so I suppose it's dead. I had better take it off ebay. Some karma for your assistance.
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robt
Full Member
Posts: 138
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Post by robt on Apr 20, 2006 18:11:46 GMT -7
Gary, thanks...you might still want to check with someone else. Also, even if the coil IS dead, the PU has some real value as someone would buy it to rewind it. You could sell it at a reduced price with a dead coil. You might even want to call Skip for his advice--tell him Bob Smith recommended him to you--and see what he says. He's one of the most knowledgeable guys I've met, a good friend, and one of my Teles and my Strat as well have his rewound pickups in them. Best of luck.
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Post by zdogma on Apr 20, 2006 19:53:11 GMT -7
Hi Gary.
I usually only have to check tele and braided wire humbuckers, but here's my two cents. I'm guessing the old p90's have braided wire?
For teles I just touch to probes to hot and ground (yellow and black). With braided casing I touch 1 probe to core wire (hot) and one to braided casing (ground).
Don't really know if that's the right way or not, but it gives readings very close to specs (within .1-.2 KOHM) for most pickups.
I'd also check another pickup to make sure the meter is working right.
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