:I have a Philco 40-180 speaker coil measuring approx 1kOhms on one side of transformer and 4 ohms on the other terminals. Based on the Rider's schematic I have it doesn't seem right. I would have expected 500ohms on the one side and the other side the schematic doesn't specify. Trying to figure this out before I send this speaker out for re-coning. The speaker cone is wasted! Thanks for the help. Tony
Tony, the field coil is reading right...no other side to it. You are measuring the DC resistance of the voice coil. Just check and follow thru from those terminals and you should see them physically connected to the voice coil at the cone.
Bill