My filter choke in this Airline Model 62-144 is going snap, snap and I want to replace it but why does it have three leads coming out of it instead of two?

Hi John

Your radio would have had a speaker with field coil acting as choke, L1. It should measure around 1200 ohms.

Someone may have replaced the speaker and added a choke for L1. An autotransformer made as Vertical Output has three wires and would work. I've used these in the past and expect others have also? Can you see where it arcs?

http://www.nostalgiaair.org/PagesByModel/285/M0011285.pdf

Norm

:My filter choke in this Airline Model 62-144 is going snap, snap and I want to replace it but why does it have three leads coming out of it instead of two?
:

The schematic does not show a 3ed wire. However your radio may not be exactly as shown. It could have a hum bucking coil where one of the wires is connected to the audio output transformer. Trace the wires in the radio.

:The schematic does not show a 3ed wire. However your radio may not be exactly as shown. It could have a hum bucking coil where one of the wires is connected to the audio output transformer. Trace the wires in the radio.
:
One wire from the choke goes to the + ends of the filters. The wire next to it on L1 goes to pin 2 0f the 42 tube and the the other side of L1 goes to the speaker socoket and next to this wire on L1 a lead comes out and is tied to ground (the case of L1).

Does your radio have a frame type choke? The original speaker should of had the field coil incorporated with the speaker. As you can see your description does not agree with the schematic. Your radio may have been modified. Also your description of the connections sounds wrong. The choke should not be connected to the plate of the output tube. This could be why you have problems.

John

That's an Audio Output Transformer. Pin #2 of a 42 is plate.

One secobdary wire is probably connected to chassis and not noticed.

Norm

::The schematic does not show a 3ed wire. However your radio may not be exactly as shown. It could have a hum bucking coil where one of the wires is connected to the audio output transformer. Trace the wires in the radio.
::
:One wire from the choke goes to the + ends of the filters. The wire next to it on L1 goes to pin 2 0f the 42 tube and the the other side of L1 goes to the speaker socoket and next to this wire on L1 a lead comes out and is tied to ground (the case of L1).
:

Need to clarify the components of your radio. T-10 is an audio output Transformer. The primary winding is connected to pin 2 of the 42 tube. The other primary wire is connected to the positive side of the filter capacitors. The secondary winding is connected to the speaker voice coil. The other secondary winding does go to chassis ground. So would be one side of the speaker voice coil. L-1 is the field coil, and is also the filter choke. This two wire coil is directly behind the cone of the speaker in the frame work of the speaker.