08-06-2023, 02:23 PM
I’ve started looking at the Stewart Warner model 415 speaker. (It could also be a 425 which looks the same on the exterior but came out a year later in 1927.) I previously had the backside off of it and today was able to get the front off.
[Image: https://www.dropbox.com/s/41r4kom1enh9yd....jpg?raw=1]
[Image: https://www.dropbox.com/s/51rvq8yfgnwifu....jpg?raw=1]
[Image: https://www.dropbox.com/scl/fi/v46s7qw23...n9og&raw=1]
The magnet and coils are connected in ways I have yet to sort out. The speaker cone center is connected with a small rod to two other rods that connect into the coil/magnet assembly. I could not get a good picture of it but Sonny at radiolaguy.com has some great images. Scroll down and see the “original drive” image. If I unscrew the two big screws on the bottom of the assembly it does come loose but remains connected to the speaker coil via the rods you see in Sonny’s photo, so I can’t just remove it. It appears I would have to remove the entire cone to access the the coil assembly. One or both of the coils are open.
[Image: https://www.dropbox.com/scl/fi/v46s7qw23...n9og&raw=1]
The main body of speaker seems to be brass (at least it is non-magnetic) although the rims that hold the grill cloth and “dancing ladies” are steel. Unfortunately with this set some of that steel has rusted badly and I suspect when I remove the rust it will be very thin, pitted and deformed. I’ll have to think about how to fix that, perhaps some car body epoxy. I don’t have the capability to weld but could solder in some metal if needed also. That’s for later.
[Image: https://www.dropbox.com/s/41r4kom1enh9yd....jpg?raw=1]
[Image: https://www.dropbox.com/s/51rvq8yfgnwifu....jpg?raw=1]
[Image: https://www.dropbox.com/scl/fi/v46s7qw23...n9og&raw=1]
The magnet and coils are connected in ways I have yet to sort out. The speaker cone center is connected with a small rod to two other rods that connect into the coil/magnet assembly. I could not get a good picture of it but Sonny at radiolaguy.com has some great images. Scroll down and see the “original drive” image. If I unscrew the two big screws on the bottom of the assembly it does come loose but remains connected to the speaker coil via the rods you see in Sonny’s photo, so I can’t just remove it. It appears I would have to remove the entire cone to access the the coil assembly. One or both of the coils are open.
[Image: https://www.dropbox.com/scl/fi/v46s7qw23...n9og&raw=1]
The main body of speaker seems to be brass (at least it is non-magnetic) although the rims that hold the grill cloth and “dancing ladies” are steel. Unfortunately with this set some of that steel has rusted badly and I suspect when I remove the rust it will be very thin, pitted and deformed. I’ll have to think about how to fix that, perhaps some car body epoxy. I don’t have the capability to weld but could solder in some metal if needed also. That’s for later.
