02-19-2022, 11:36 PM
Have the radio recapped, checked all the resistors, traced out all the coils and verified continuity but found I have an open primary on the 2nd IF between the 6D6 IF tube and the 75 tube. I removed the can and checked out the coil and all the external connections are still present and connected so the break must be in the coil winding itself. Short of trying to rewind the coil...which I really don't want to attempt...is there a way to bypass that open primary? I was getting -6 volts on the plate of the 6D6 IF tube instead of the 180 volts it calls for which was the red flag, otherwise all other voltages are present, albeit a bit high.
Both IF cans measured 20 ohms on the primary and secondary sides (well just the secondary on the 2nd IF, of course). I found an IF from a 1936 5 tube Crosley I parted out that has 28 ohm primary and secondary windings, so I gater wired that in just to see if it made a difference. I now have 182 volts on the plate of the 6D6 IF tube, but otherwise the radio is dead. No noise from the center of the volume control, however on the plate of the 75 tube I have a somewhat weak output buzz that's controllable by the volume control. Otherwise there's no buzz touching the grid caps of any of the 6D6's or the 75 tube.
Everything that could go wrong on this radio did. Open speaker field coil, fried power transformer, and now open IF can. But I'm determined not to take if off life support!
Greg V.
West Bend, WI
Member WARCI.org