Philco Model 70 Restoration w/Pictures

[Electronic M]

Those replacement caps look more like late 30's to mid 50's. Even by the early 50's repair shops were starting to favor the plastic shell types over the paper cased caps, by the 60's orange drops were becoming the repair shop favorite.

Those coils tend to go open from corrosion of the windings I don't think the material in the forms had anything to do with it. The 60 chassis and the 80 both tend to have open Ant. and or Osc. coils.

[Zsuttle]

Originally Posted by Electronic M

Those coils tend to go open from corrosion of the windings I don't think the material in the forms had anything to do with it. The 60 chassis and the 80 both tend to have open Ant. and or Osc. coils.

I had tended to hear that the secondary winding was made from enameled copper wire whereas the primary was cloth coated. A few sources stated that the celluloid plastic was the culprit for dissolving the primary but not secondary windings. But yes, corrosion of any sort was the cause of the open coil(s)