LOL....Class Ahhh. Possum, your just insanely cool!! : )
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cool.....
guys print this thread out and file it away somewhere, this was a good one......http://www.SDpickups.com
Stephens Design Pickups
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a test....
don't have time to do this but a good test for you guys with the Extechs should wind a strat pickup to 7K with poly then one with PE and see if they do what we talked about here, wish I had time to do it.http://www.SDpickups.com
Stephens Design Pickups
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UL insulation class
Originally posted by Possum View Post... Plain enamel is described as Class A as are formvar and the poly wires. Epoxy and polyester are described as class B and teflon as class H. ... What is the class system referring to anyway A/B/H ?
A search turns up Underwriters Lab insulation class with numbers like:
Y 90 °C
A 105 °C
E 120 °C
B 130 °C
F 155 °C
H 180 °C
N 200 °C
R 220 °C
S 250 °C
It has been superceded by the NEMA-1000 specs you see on MWS and the rest.
Teflon is desicrbed as having excellent dielectric properties, so maybe plain enamel is the same as formvar and poly?
Some insulations are also piezoelectric -- they move when you give them a voltage and vice versa. For example, Kynar insulation is tough stuff and, although unsuitable for magnet wire, is great for piezoelectric pickups.
The point is that some insulations contribute to microphonics more than others and make you want to pot the pickup.
-drhHe who moderates least moderates best.
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Haven't got time to read through all the posts in this thread, but I'm wondering about the extent to which the various insulations are uniform in their thickness, as a result of their viscosity and tendency to shrink or clump during drying. That is, is one of them more inconsistent in its thickness along its length? I would think that could have effects tantamount to "scatter".
Or am I out to lunch?
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Originally posted by DrStrangelove View PostAll I can find on plain enamel calls it oleoresinous enamel or yellow varnish.
Interestingly, olioresin is made from organic plant compounds. When used in varnish it's usually made from Canada Balsam.
You don't have to bake it, but I can't imagine wire makers letting it air cure either.
Might be a good stuff to pot pickups in.
Nitrocellulose was originally made from cotton. So maybe when people say something sounds "organic" they are being literal!
Also, oleoresin capsicum is the proper name for pepper spray!
Originally posted by DrStrangelove View PostI'll certainly try. A dielectric is an insulator for direct current but it often passes AC. The AC qualities of interest are dielectric constant and dielectric absorption (loss factor). Low dielectric constant (d.c.)means it's a poor capacitor, like air ( = 1.0) while a higher number means it passes AC better.
So now we can see how different insulations would change the capacitance of the coil.
This is getting interesting!Last edited by David Schwab; 07-24-2007, 03:02 PM.It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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Originally posted by DrStrangelove View PostSome insulations are also piezoelectric -- they move when you give them a voltage and vice versa. For example, Kynar insulation is tough stuff and, although unsuitable for magnet wire, is great for piezoelectric pickups.
The point is that some insulations contribute to microphonics more than others and make you want to pot the pickup.It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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a little perspective
Originally posted by David Schwab View PostThat would be it then... spar (marine) varnish. You see a lot of old electrical things coated in varnish. I'm guessing that was one of the first insulators used.
plain enamel, oleoresin enamel, yellow varnish, and spar varnish.
There are probably a few more synonyms out there.
Interestingly, olioresin is made from organic plant compounds. When used in varnish it's usually made from Canada Balsam.
It means is that there is a resin in an oil solution or suspension.
You don't have to bake it, but I can't imagine wire makers letting it air cure either.
Might be a good stuff to pot pickups in.
Nitrocellulose was originally made from cotton. So maybe when people say something sounds "organic" they are being literal!
So now we can see how different insulations would change the capacitance of the coil.
This is getting interesting!
You folks are going to shit when we dig into mutual inductive coupling of adjacent windings -- it's at the heart of why scatterwinds sound so much better.
-drhHe who moderates least moderates best.
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