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Post by stratboy on Apr 18, 2024 20:49:20 GMT -6
Hello
I have a 1992 Les Paul Studio Lite with M-3 wiring. That’s two humbuckers and a single coil HSH with a 5-way switch that gets lots of interesting sounds.
Here’s my problem: somebody rewired the guitar before I got it so it is not in the original factory configuration. Easy to return to stock EXCEPT the original had a 5 Henry coil in the circuit that served as a low pass noise suppression filter. Gibson only made the guitar for a couple of years and no longer has the part.
Do any of you happen to have a 5H inductor lying around, or better yet, an original Gibson 5H coil from a salvaged M-3 harness? OR can someone steer me to a person who could custom wind a coil for me?
It’s a long shot but I’m hopeful.
Thanks!
Gibson Repair and Restoration just confirmed the coil is 0.5H, not 5H as originally posted.
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ericn
Temp
Balance Engineer
Posts: 16,083 
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Post by ericn on Apr 19, 2024 13:16:59 GMT -6
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Post by stratboy on Apr 19, 2024 14:02:00 GMT -6
Thanks, Eric.
A wah inductor might work. Dunlop doesn’t sell this one any more and they don’t say the inductance of their red and yellow Fasel inductors. I hadn’t thought of looking overseas. Good catch.
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Post by ironinthepath on Apr 19, 2024 14:37:28 GMT -6
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Post by svart on Apr 19, 2024 14:43:34 GMT -6
5H? wow that's a lot. It would have to be really small wires to coil that much inductance.
Like Eric said, you could find a smaller value/size inductor and then scale the cap values to get the same frequencies, but the Q of the inductor would likely be different and the rolloffs might be different.
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Post by ironinthepath on Apr 19, 2024 14:50:23 GMT -6
maybe it's time for gyrator :-)
(simulated inductor)
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Post by stratboy on Apr 19, 2024 15:04:50 GMT -6
5H? wow that's a lot. It would have to be really small wires to coil that much inductance. Like Eric said, you could find a smaller value/size inductor and then scale the cap values to get the same frequencies, but the Q of the inductor would likely be different and the rolloffs might be different. The value was revised to 0.5 Henry. |
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Post by ironinthepath on Apr 19, 2024 15:06:10 GMT -6
Found a forum on the Fasel Inductor, it at least seems to be in the right ball park in terms of inductance (seem to error on the high side, maybe closer to 0.6H) according to measurements by others - you could measure it yourself if you buy one: www.lespaulforum.com/index.php?threads/fasel-inductor.167442/I'd probably go this route if I was in your shoes, at least the Dunlap part targets an audio application. If you don't have an RLC meter you could just configure the Fasel with a known R and C and find the resonant frequency by sweeping a sine wave generator and looking for where the RLC output peaks (resonates), should be at something like 1/(2*pi*sqrt(LC)). With damping (the resistance R) the actual peak will be somewhat lower frequency, but likely negligible if R small. (You can use a more exact equation for under-damped response if you want: see en.wikipedia.org/wiki/RLC_circuit). Main point - you can back calculate for the L knowing the other values, adjust the final C value you use to compensate (make it act like the original). Or...you can just stick in the Fasel --> "if it sounds right, it is right" |
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Post by stratboy on Apr 19, 2024 15:07:05 GMT -6
maybe it's time for gyrator :-) (simulated inductor) Gyrator uses an IC. The Les Paul is passive. Good idea in most cases, but I don’t want to put a battery in my LP. |
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Post by stratboy on Apr 19, 2024 15:08:39 GMT -6
Found a forum on the Fasel Inductor, it at least seems to be in the right ball park in terms of inductance (seem to error on the high side, maybe closer to 0.6H) according to measurements by others - you could measure it yourself if you buy one: www.lespaulforum.com/index.php?threads/fasel-inductor.167442/I'd probably go this route if I was in your shoes, at least the Dunlap part targets an audio application. If you don't have an RLC meter you could just configure the Fasel with a known R and C and find the resonant frequency by sweeping a sine wave generator and looking for where the RLC output peaks (resonates), should be at something like 1/(2*pi*sqrt(LC)). With damping (the resistance R) the actual peak will be somewhat lower frequency, but likely negligible if R small. (You can use a more exact equation for under-damped response if you want: see en.wikipedia.org/wiki/RLC_circuit). Main point - you can back calculate for the L knowing the other values, adjust the final C value you use to compensate (make it act like the original). Or...you can just stick in the Fasel --> "if it sounds right, it is right" Thanks! I couldn’t find the value of the Fasel inductors. |
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Post by svart on Apr 19, 2024 15:26:21 GMT -6
5H? wow that's a lot. It would have to be really small wires to coil that much inductance. Like Eric said, you could find a smaller value/size inductor and then scale the cap values to get the same frequencies, but the Q of the inductor would likely be different and the rolloffs might be different. The value was revised to 0.5 Henry. Oh ok, that's better. There's a handful of them in eBay |
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