I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!

:I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
Hi Steve!
Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
Mark

::I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
:Hi Steve!
: Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
:Mark
:Mark,
Thanks for your reply. You are correct, 3 wires one with voltage. Is there anyway to tell which wire is which on the speaker?
Thanks for all your help

::I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
:Hi Steve!
: Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
:Mark
:One other thing I need too know, how does the speaker connect too the chassis, hardwire or plug connector?
Mark

:::I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
::Hi Steve!
:: Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
::Mark
::One other thing I need too know, how does the speaker connect too the chassis, hardwire or plug connector?
:Mark
:

:::I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
::Hi Steve!
:: Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
::Mark
::One other thing I need too know, how does the speaker connect too the chassis, hardwire or plug connector?
:Mark
:The speaker wires were connected to the radio (chassis) wires with wire nuts.

Steve,
First of all, read the change pages for the code 121 and 124 (I didn't). Since the field coil is a series inductor for the power supply circuit, there should be at least 2 wires for that connection, (neither grounded) and 2 wires for the voice coil connection as shown on the schematic. The other thought is that some change altered the output transformer connection to the speaker by grounding one lead on it and one lead on the voice coil and using just one lead to feed audio to the speaker. In this case the, the second wire for the field coil can be found by process of elimination, and continuity tests to the power supply section. Otherwise, a second connection to the field coil must be found (may be broken inside the field coil housing). The other 2 leads would be from the audio output transformer (polarity insensitive) and connect to the speaker voice coil. Without the field coil in the circuit, your light bulb test was filaments/lamps only.
marv

::::I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
:::Hi Steve!
::: Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
:::Mark
:::One other thing I need too know, how does the speaker connect too the chassis, hardwire or plug connector?
::Mark
::The speaker wires were connected to the radio (chassis) wires with wire nuts.

:Steve,
:First of all, read the change pages for the code 121 and 124 (I didn't). Since the field coil is a series inductor for the power supply circuit, there should be at least 2 wires for that connection, (neither grounded) and 2 wires for the voice coil connection as shown on the schematic. The other thought is that some change altered the output transformer connection to the speaker by grounding one lead on it and one lead on the voice coil and using just one lead to feed audio to the speaker. In this case the, the second wire for the field coil can be found by process of elimination, and continuity tests to the power supply section. Otherwise, a second connection to the field coil must be found (may be broken inside the field coil housing). The other 2 leads would be from the audio output transformer (polarity insensitive) and connect to the speaker voice coil. Without the field coil in the circuit, your light bulb test was filaments/lamps only.
:marv
:
:::::I've purchased my first radio, which I am trying to restore. I've had all the tubes tested and they are fine. I built a dim-bulb tester and tested the radio and everything seems fine. In my hast to test the radio, I failed to mark the speaker wires when I pulled it from the cabinet. Now I have three wires of the same color (cloth covered white) and I don't know how to reconnect them. The schematic shows two wires (white & green) coming off the output transformer, each with an intermediate connection to other components. I also have 100+ volts coming off one lead from the chassis (no voltage on the other leads). I'm afraid to play musical connections with the leads for fear of blowing my speaker (original). I would be thankful for any help!
::::Hi Steve!
:::: Let me get this straight, you have a total of 3 wires, one of which has 100+ volts on it and the other two have no voltage on them, if this is correct then the 100+ volt wire is your Field Winding wire and the other two would be the Voice Coil Wires, you might want to ask Thomas Dermody about this to make sure I'm correct on this, hope this helps you out.
::::Mark
::::One other thing I need too know, how does the speaker connect too the chassis, hardwire or plug connector?
:::Mark
:::The speaker wires were connected to the radio (chassis) wires with wire nuts.

Thanks everybody for your help. I followed everyone's suggestions and I think I was able to determine which one was which. I connected the wires and plugged the radio into my dim-bulb tester and got a hum out of the speaker and a dimly lit bulb. I quickly turned off the radio. I guess next step is check the power supply and change out the caps. Thanks again for all your help.
Steve

Everybody: If the output transformer is mounted to the speaker, connecting the speaker is very easy. There should only be 3 wires, not 4 or 5 or any other number. The secondary of the output transformer is already connected to the voice coil and hum bucking coil on the speaker, so no need to worry about the voice coil at all. Unless you remove the output transformer, there is no need for tampering with these connections, and so they should still be connected as from the factory. Here is how the primary is connected and why there are only 3 wires: one wire goes to one side of the output transformer primary. This wire was originally green and can be colored green again. Another wire goes to both the other side of the output transformer primary and to one side of the field coil. This wire was originally white and probably is still some light shade. The third wire goes to the other side of the field coil, and was originally green with a white tracer. You may color this wire with alternations of green (green, white, green, white, etc.). A green permanent marker will work well for coloring the green wires.

The first wire discussed (green) connects to the plate of the output tube (pin 3). The second wire (white) connects to the 2nd grid of the output tube and the other components that connect here (pin 4). The third wire (green with white tracer) connects to the cathode of the rectifier tube (either of the filament pins will do, but not both).

If you still cannot figure out which wire is which, your ohm meter will tell you. The two wires which give the highest resistance are your green and green with white tracer wires. The remaining wire is your white wire. The one of these two green wires to the white wire that gives 1140 ohms is the green with white tracer wire that goes to the cathode of the rectifier. These two wires go to the field coil as mentioned before. The other green wire (without tracer) to the white wire should give you a resistance of 400 ohms. These two wires in combination go to the primary of the output transformer. Connect this green wire to the plate of the output tube. Connect the white wire to pin 6 of the output tube as mentioned before.

Also, the articles about changes to code 121 and 124 have no bearing on the power supply or the speaker, so they can be disregarded. All these articles mention are changes to the radio frequency section and the audio section. They mention no changes to speaker connection.

Thomas

:Everybody: If the output transformer is mounted to the speaker, connecting the speaker is very easy. There should only be 3 wires, not 4 or 5 or any other number. The secondary of the output transformer is already connected to the voice coil and hum bucking coil on the speaker, so no need to worry about the voice coil at all. Unless you remove the output transformer, there is no need for tampering with these connections, and so they should still be connected as from the factory. Here is how the primary is connected and why there are only 3 wires: one wire goes to one side of the output transformer primary. This wire was originally green and can be colored green again. Another wire goes to both the other side of the output transformer primary and to one side of the field coil. This wire was originally white and probably is still some light shade. The third wire goes to the other side of the field coil, and was originally green with a white tracer. You may color this wire with alternations of green (green, white, green, white, etc.). A green permanent marker will work well for coloring the green wires.
:
:The first wire discussed (green) connects to the plate of the output tube (pin 3). The second wire (white) connects to the 2nd grid of the output tube and the other components that connect here (pin 4). The third wire (green with white tracer) connects to the cathode of the rectifier tube (either of the filament pins will do, but not both).
:
:If you still cannot figure out which wire is which, your ohm meter will tell you. The two wires which give the highest resistance are your green and green with white tracer wires. The remaining wire is your white wire. The one of these two green wires to the white wire that gives 1140 ohms is the green with white tracer wire that goes to the cathode of the rectifier. These two wires go to the field coil as mentioned before. The other green wire (without tracer) to the white wire should give you a resistance of 400 ohms. These two wires in combination go to the primary of the output transformer. Connect this green wire to the plate of the output tube. Connect the white wire to pin 6 of the output tube as mentioned before.
:
:Also, the articles about changes to code 121 and 124 have no bearing on the power supply or the speaker, so they can be disregarded. All these articles mention are changes to the radio frequency section and the audio section. They mention no changes to speaker connection.
:
:Thomas

Thomas,
You rock! Your description is exactly my setup. I followed your suggestions and I'm picking up several stations. However, I am getting a loud low freq. hum over the voices. I'm using about 15 feet of solid wire as a temp antenna. Any Ideas about what it could be? I've also read several articles that suggest replacing caps no matter what. I've inspected the underside of the chassis and I don't see goo anywhere or wax caps leaking or deformed. I would love to keep it as close to original as possible. Am I playing with fire? Any recommendations?