been winding a ton of toroids lately on our machine at work.
learning some cool stuff.
1) wire pitch affects the toroid.
In other words, lets say you need 1000 turns wound on a core.
How many times do you circle the core?
Three? Five?
It makes a difference, very slight, but it is there.
How would this affect sound?
Thats when you hop on the bench to find out.
this machine lets you program in any wire pitch you like, via a keyboard.
2) wire size
dcr will change depending on the wire size.
this combines with the non linear properties of your average inductor to produce yet, another effect.
if you want a transformer to put out say, 10 volts max, and exactly 5 volts at half power, you need to pick the wire right.
distortion due to non linear voltage curves can be minimized by doing more bench work.
unfortunately, the formulas only take you so far, so you hop on the bench, which saves time anyway, as the theories are always opposite the results.
so now you have two tweaks to play with, which combine to form, say, 4 wire size possibilities, and maybe 4 more pitch possibilities, so multiply to get 16 different inductors by using the same core, and the same turns, arghh!
but fortunately, a lot of the combinations overlap, so you only end up with maybe four distinct inductors for the same core and turns, still, I'm jus sayin...
So in order to duplicate the original Pultec inductor, I am afraid you would have to look at the winding technique and measure the wire, which means, gulp,...a dissection on a very rare and expensive part.
kh, how did you get the turns from your orig P inductors?
PRR method?
Also, do not forget the wax.
Every company had their own potting formula, which could tweak the high end.
Again, these are microscopic tweaks, but when you are trying to duplicate the original mojo, you try to get as much info as possible.
Also, list the way you get the Al number, because it varies depending on meter used, and turns used.
You tend to get a better Al as you add wire, up to a point when the dcr starts to drag it back down.
but veve have vays of getting information
