Thoughts on Quarter Pound (noiseless) Stack?
- Thread starter Artie
- Start date
There was a thread about this. I don't know if anyone has any recent info. I certainly have never tried anything like that.
strat dude
Active member
I thought th STK -s6 was supposed to be close to that?
freefrog
Well-known member
Given how inductance destroys itself in noise cancelling stacked coils, a QP stack would potentially require above 24k of wire... I'd also expect gobs of eddy currents from the rod magnets, which would have not only to measure a quarter of an inch in diameter, but also to be twice as long...
Not that it can't be solved: steel rods under rod magnets would increase the inductance and allow the use of less wire. But they would also rise Foucault currents, without treating a few other issues inherent to stacked coils designs.
Not that easy to engineer in my feable mind.
I'd rather mount a separate dummy coil. One of the lasts that I've put in a guitar was for a DynaSonic (low resistance SC but with the same kind of big rod mags than a QP )... Between hot point and output, the dummy worked surprinsingly well, with almost no tonal change (It's true that a regular DynaSonic already suffers from eddy currents with all its height setting screws and springs, + the metallic cover around its top).
Even better was the rectangular Ilitch coil that I've wound myself then mounted on the back of a Hamer with P90's - between pickups and ground, this time. Sorry, I can't find the specs of the coil but it was easy and quick to wind with thick wire (AWG 38 or 36, I don't remember). It added just a few hundreds of Ohms to each pickup and virtually no inductance. It didn't make the P90's as quiet as a stack but tamed the hum enough to be considered as a full success.
Only downside: it's cumbersome. But I vastly prefered my rectangular noise cancelling air coil to the super expensive "rhomboid" one sold by Ilitch for P90's...
FWIW.
Not that it can't be solved: steel rods under rod magnets would increase the inductance and allow the use of less wire. But they would also rise Foucault currents, without treating a few other issues inherent to stacked coils designs.
Not that easy to engineer in my feable mind.
I'd rather mount a separate dummy coil. One of the lasts that I've put in a guitar was for a DynaSonic (low resistance SC but with the same kind of big rod mags than a QP )... Between hot point and output, the dummy worked surprinsingly well, with almost no tonal change (It's true that a regular DynaSonic already suffers from eddy currents with all its height setting screws and springs, + the metallic cover around its top).
Even better was the rectangular Ilitch coil that I've wound myself then mounted on the back of a Hamer with P90's - between pickups and ground, this time. Sorry, I can't find the specs of the coil but it was easy and quick to wind with thick wire (AWG 38 or 36, I don't remember). It added just a few hundreds of Ohms to each pickup and virtually no inductance. It didn't make the P90's as quiet as a stack but tamed the hum enough to be considered as a full success.
Only downside: it's cumbersome. But I vastly prefered my rectangular noise cancelling air coil to the super expensive "rhomboid" one sold by Ilitch for P90's...
FWIW.
freefrog
Well-known member
Oh, and as I can't find the specs of my home made coil in my archives, here is a potentially useful link.
https://www.tdpri.com/threads/diy-large-hum-cancelling-coil.670923/
https://www.tdpri.com/threads/diy-large-hum-cancelling-coil.670923/
Artie
Peaveyologist
Very useful. Nice link.
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