UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Argus25 · 2nd Feb 2018, 10:58 am

Keith,

If you have a sample of the original wire and know the diameter of the copper, and acquire its resistance from R = pL/A (or the wire tables) it helps and if you can measure the geometry of the space the wire occupied (regardless of any insulation with it), you can from that estimate the average turn length. Then if somebody has the original DC resistance value of the winding, you can work out the number of turns that were there in the first place. (R = ohms, L = length, A = Cross sectional area of the wire, p = 1.72 x 10E-8 for copper off hand)

Failing that , somebody may have the turns number data on file.

Hugo.

2nd Feb 2018, 10:58 am	#2
Argus25 No Longer a Member Join Date: Oct 2016 Location: Maroochydore, Queensland, Australia. Posts: 2,679	Re: Bush TV22 restoration Keith, If you have a sample of the original wire and know the diameter of the copper, and acquire its resistance from R = pL/A (or the wire tables) it helps and if you can measure the geometry of the space the wire occupied (regardless of any insulation with it), you can from that estimate the average turn length. Then if somebody has the original DC resistance value of the winding, you can work out the number of turns that were there in the first place. (R = ohms, L = length, A = Cross sectional area of the wire, p = 1.72 x 10E-8 for copper off hand) Failing that , somebody may have the turns number data on file. Hugo. Last edited by Argus25; 2nd Feb 2018 at 11:15 am.