Steve's Special (& similar) not fully humbucking? - Jemsite
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post #1 of 5 (permalink) Old 01-19-2004, 06:39 PM Thread Starter
 
Join Date: Jun 2001
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Steve's Special (& similar) not fully humbucking?

So it occurs to me that something with asymmetrical coils like a Steve's Special (around 7k in one coil, around 12k in the other) would not cancel hum as well as a bucker with equal coils.

I never noticed this, but I wonder if that's how it is...
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post #2 of 5 (permalink) Old 01-20-2004, 08:53 PM
 
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Yeah I contemplate that all the time. Best I can tell it's not a direct correlation. For example, a pickup with one coil at 5K and the other coil at 10K wouldn't have "half the hum-cancelling" effect as one with two 5k coils. (i.e. twice the hum) In other words, the fact that two RW/RP coils exist is a bigger part of cancelling hum than the actual resistance match. To what effect I'll never know, (and I don't care) But I'm sure it's a variable and not constant. In other words, the majority of noise is cancelled once you get to within a certain range, and it's less apparent after that.

As for me, my gear is pretty good, and I have a lot of guitars with single coils too. So a slightly noisier humbucker is like getting a free box of chocolates, and then you notice one's missing. I'm just glad it's cancelling hum. I've had a couple guitars with variable coil bleeds so I could dial in how much of "coil 2" I wanted. Now, they were audio taper pots so it's impossible to say at which point this occurred, but the phenomenon was that I could get to a certain point where it still sounded very much like single coil mode, but with a fair amount of hum cancelling too. Sort of a "best of both worlds" scenario. I guess I could've measured the output of each coil at that point, but that was before you posted, and now the coil bleed pots are no more! Plus that wouldn't directly answer this scenario because I was removing output, not coil windings.
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post #3 of 5 (permalink) Old 01-20-2004, 09:54 PM
 
Join Date: May 2001
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You're on the right track. The hum doesn't depend on the number of turns in the coils and it doesn't come from the magnets. The hum is from an outside electrical field that creates an electrical field in the coils. Since the humbucker has two opposite windings, any stray electrical field that gets picked up also gets picked up in the oppositely wound coil. As both of these noise signals are across all the wire at the same time, they dampen or cancel each other. It's a similar concept to the twisted pair (carrying differential voltages).
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post #4 of 5 (permalink) Old 01-21-2004, 03:17 AM
 
Join Date: Jun 2003
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sorry..but would this have anything to do with grounding? or 60 cyl hum?
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post #5 of 5 (permalink) Old 04-23-2005, 07:30 PM
 
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Re: Steve's Special (& similar) not fully humbucking?

Actually what the original poster said was true, at least that's what someone at DiMarzio told me when I called them about appalling RF noise with the Tone Zone pickup. I couldn't believe how much more noise it picked up compared to my other humbuckers. I called them and the person said that yes, pickups with assymetrical coils will pick up more RF noise than regular ones.
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