02-05-2013, 07:55 PM
You're close, but those two wires don't merely "go nowhere." They are actually very important. Perhaps you're not seeing the forest for the trees, or de trees for deForest, or whatever.
Okay. Pay close attention to the following.
38-116 Code 125 partial schematic.
[Image: http://i326.photobucket.com/albums/k420/...8f192d.jpg]
Pay extra close attention to part (96), the Magnetic Tuning off-on switch.
The 38-116 schematic, as well as this partial schematic, shows the Magnetic Tuning switch ON. Notice how the circuit is completed from the 6.3 volt source to the flood lamps? Notice also the other section of the switch is NOT connected between the parallel wires which go in one direction to the three capacitors of (65), resistors (64) and (88 ), and on to the discriminator circuit - and, in the other direction, to the magnetic tuning shorting switch (97) that is on the Automatic Tuning mechanism, and on to the 6N6G tube through resistors (28 ) and (29).
Now, look at this variation of a partial schematic, paying close attention to switch (96) again:
[Image: http://i326.photobucket.com/albums/k420/...250bf4.jpg]
This, which I just took the time to create in Paint Shop Pro, shows how switch (96) looks when it is turned off. See now how the 6.3 volt filament source is now disconnected from the flood lamps? Notice also the other section of switch (96) - it now shorts the two parallel wires. In this manner, when the Magnetic Tuning switch is off, the discriminator circuit is shorted out and Magnetic Tuning does not function.
If your switch is not connected as described, your radio's Magnetic Tuning circuit will never work right.
Please study these two partial schematics and get a handle of the circuitry before proceeding. Your radio will thank you.
Okay. Pay close attention to the following.
38-116 Code 125 partial schematic.
[Image: http://i326.photobucket.com/albums/k420/...8f192d.jpg]
Pay extra close attention to part (96), the Magnetic Tuning off-on switch.
The 38-116 schematic, as well as this partial schematic, shows the Magnetic Tuning switch ON. Notice how the circuit is completed from the 6.3 volt source to the flood lamps? Notice also the other section of the switch is NOT connected between the parallel wires which go in one direction to the three capacitors of (65), resistors (64) and (88 ), and on to the discriminator circuit - and, in the other direction, to the magnetic tuning shorting switch (97) that is on the Automatic Tuning mechanism, and on to the 6N6G tube through resistors (28 ) and (29).
Now, look at this variation of a partial schematic, paying close attention to switch (96) again:
[Image: http://i326.photobucket.com/albums/k420/...250bf4.jpg]
This, which I just took the time to create in Paint Shop Pro, shows how switch (96) looks when it is turned off. See now how the 6.3 volt filament source is now disconnected from the flood lamps? Notice also the other section of switch (96) - it now shorts the two parallel wires. In this manner, when the Magnetic Tuning switch is off, the discriminator circuit is shorted out and Magnetic Tuning does not function.
If your switch is not connected as described, your radio's Magnetic Tuning circuit will never work right.
Please study these two partial schematics and get a handle of the circuitry before proceeding. Your radio will thank you.
--
Ron Ramirez
Ferdinand IN
