Duncan interview videos at the factory....

[Joe Gwinn]

i didn't unwind it...using the DCR values to determine that they were wound the same...of course this isn't exact....maybe off a few turns but generally in the same neighborhood.

If the coil forms are the same, also measure the inductance, as this varies with the square of the turns count and is independent of the DC resistance (which varies with wire guage and how much it was stretched while winding). Inductance is a very sensitive indicator of turns count.

The full strength version is to make a 2D dot plot, where one axis is DC resistance and the other axis is the square root of 1 KHz inductance. As you add or remove turns on a coil, the dots will largely fall on a straight line.

[kevinT]

If the coil forms are the same, also measure the inductance, as this varies with the square of the turns count and is independent of the DC resistance (which varies with wire guage and how much it was stretched while winding). Inductance is a very sensitive indicator of turns count..

Good point, I will take a reading with the good ol LCR meter and see what comes up.

The full strength version is to make a 2D dot plot, where one axis is DC resistance and the other axis is the square root of 1 KHz inductance. As you add or remove turns on a coil, the dots will largely fall on a straight line.

That is a good way to find out....however, not really pressed about dissecting it....it is a part of my collection