I agree completely with these comments. I had the same thing happen to me when checking out a 30K-4 mod xfmr. The transformer turned out to be fine, however, Later, it did fail and I had significantly different readings than when I measured it the first time.
Thanks also Steve for the additional light bulb test! Good info!
73, Jack, W9GT
The unequal DC resistance from the CT to either side of the winding is normal. The reason is that although there will be the same number of turns either side of the CT, the length of wire is different since the winding radius gets larger as more turns are piled on. The outer turns have a greater circumference per turn. This all adds up to greater resistance of the wire on the outside half of the center tapped winding.
Chuck K1KW
Yep - I've seen this in most transformers too. Makes sense.
It certainly is alarming the first time we come across it.
T