A sample of original 214 wire measures about .0192 (and about .015 of that seems to be copper). I measured an original 218 wire at .0181 so I wondered if it was a smaller diameter of copper. I have .012 and .015 wire, but nothing in between, and this seemed like it might be in between, possibly .014 (I have a document that says it's .013 but I'm pretty sure that's wrong.)
I went ahead and wound a 218 cell coil with my .015 until the form looked about full, and the resistance turned out as 6.2k (old coils are 5.1~6.0k). The coil works and amplitude looks good.
Victory, and a relatively simple one at that. I think the newer 218 wire might have about the same copper diameter, but thinner (newer technology) coating. (My modern wire measures .0185)
I don't need 218 coils yet, as I have some old ones, but people keep asking about them, so I figured I'd try it. It's comforting to know it's not harder than the 214 coils.
I went ahead and wound a 218 cell coil with my .015 until the form looked about full, and the resistance turned out as 6.2k (old coils are 5.1~6.0k). The coil works and amplitude looks good.
Victory, and a relatively simple one at that. I think the newer 218 wire might have about the same copper diameter, but thinner (newer technology) coating. (My modern wire measures .0185)
I don't need 218 coils yet, as I have some old ones, but people keep asking about them, so I figured I'd try it. It's comforting to know it's not harder than the 214 coils.