Josh
Apprentice Shielder
Posts: 43
Likes: 2
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Post by Josh on Sept 17, 2023 18:23:02 GMT -5
This vintage set of P90 pickups is allegedly from the 1960s. P90 Lead:
Ls @ 100Hz: 7.514H Ls @ 1kHz: 6.643H Rd: 8.278kΩ Cp @ 100kHz: 107.336pF Cp @ 200kHz: 110.323pF Q @ 1kHz: 2.478 Q @ 3kHz: 2.463 Q @ 10kHz: 3.381 Q @ 100kHz: 16.95 Q @ 200kHz: 19.03 P90 Rhythm:
Ls @ 100Hz: 7.376H Ls @ 1kHz: 6.39H Rd: 8.178kΩ Cp @ 100kHz: 128.632pF Cp @ 200kHz: 132.256pF Q @ 1kHz: 2.312 Q @ 3kHz: 2.113 Q @ 10kHz: 3.828 Q @ 100kHz: 14.89 Q @ 200kHz: 17.94 Bode plot comparisons:   The plots were done with -20dB set on the Integrator. Any thoughts? Thanks, Josh |
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Post by stratotarts on Sept 17, 2023 19:07:16 GMT -5
It's exactly what you would expect from P90's. I'm curious, were they RWRP?
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Josh
Apprentice Shielder
Posts: 43
Likes: 2
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Post by Josh on Sept 17, 2023 19:45:16 GMT -5
It's exactly what you would expect from P90's. I'm curious, were they RWRP? I don't know how to check if one is reverse wound, but I would assume yes as the pickup lead colors are reverse polarity on one of them. Is there a magic trick to check the wind direction that doesn't require removing the pickup tape? |
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Post by ms on Sept 18, 2023 6:22:47 GMT -5
It's exactly what you would expect from P90's. I'm curious, were they RWRP? I don't know how to check if one is reverse wound, but I would assume yes as the pickup lead colors are reverse polarity on one of them. Is there a magic trick to check the wind direction that doesn't require removing the pickup tape? If you have both pickups on the bench, you can try connecting them together with both polarities and see if one way has more hum than the other, using you favorite measuring device or even an amp. |
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Post by stratotarts on Sept 18, 2023 7:35:38 GMT -5
Put the pickup faces together. If they attract, they are RWRP. If they repel, they're not RWRP. Because, for RWRP, the magnet polarity must be opposite.
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Josh
Apprentice Shielder
Posts: 43
Likes: 2
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Post by Josh on Sept 18, 2023 19:42:00 GMT -5
Put the pickup faces together. If they attract, they are RWRP. If they repel, they're not RWRP. Because, for RWRP, the magnet polarity must be opposite. They're definitely RP, but that's not a reliable test for RW. The guy that put these pickups in the guitar was...odd. He flipped one of the mounting plates, and reversed all the pole screws to do some dumb stuff. I'll just assume they are RWRP, but the guy could have easily reversed the magnets in the process of his shenanigans. |
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Post by ms on Sept 19, 2023 6:29:18 GMT -5
Put the pickup faces together. If they attract, they are RWRP. If they repel, they're not RWRP. Because, for RWRP, the magnet polarity must be opposite. They're definitely RP, but that's not a reliable test for RW. The guy that put these pickups in the guitar was...odd. He flipped one of the mounting plates, and reversed all the pole screws to do some dumb stuff. I'll just assume they are RWRP, but the guy could have easily reversed the magnets in the process of his shenanigans. But when wired together with the wires connected as intended do they reduce hum? I guess you can always make them do so if you want since you can reverse the magnets, if necessary, and reverse the leads if required. |
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Josh
Apprentice Shielder
Posts: 43
Likes: 2
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Post by Josh on Sept 19, 2023 14:51:30 GMT -5
They're definitely RP, but that's not a reliable test for RW. The guy that put these pickups in the guitar was...odd. He flipped one of the mounting plates, and reversed all the pole screws to do some dumb stuff. I'll just assume they are RWRP, but the guy could have easily reversed the magnets in the process of his shenanigans. But when wired together with the wires connected as intended do they reduce hum? I guess you can always make them do so if you want since you can reverse the magnets, if necessary, and reverse the leads if required. I hear what you're saying, and I assume they probably do, but I won't know unless the owner asks me to install them in something. I never heard them in the LP. As soon as the LP hit the bench, those pickups came out. |
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