10-05-2022, 09:12 PM
Hi Peter,
First off, it appears that the transformer is not on the back of the speaker. What you see there is the "field coil". This is the device that provides the magnetic field.
The speaker appears to be in rather good shape. You could attempt to "recenter" the voice coil. There may be a procedure in this Phorum to do this. It usually involves ungluing the speaker cone, which may be tricky. Try this alternative procedure :
Removing any felt cover over the magnet pole and voice coil on the cone.
Loosening the 4 screws that hold the field coil and magnet piece to the speaker frame and the 2 screws that hold the "spider" to the field coil.
Place speaker on table or gently into a vice with cone side up (This will allow clearance to tighten hardware after centering.
Place shims between voice coil and field coil pole. Lift frame and lower several times.
without moving anything (and this is the tricky part) tighten all screws.
If you already tried this and failed, then remove the field coil frame by removing all 6 screws and lifting off. This way, you can inspect the voice coil.
The Phorum experts may know someone who can recone the speaker at a reasonable price.
Speakers are rated in impedance, not resistance, so the resistance reading on a DVM may not be the true impedance.
One could install a PM Speaker in the correct location, remove the field coil frame from the speaker frame, remove the connector, cut the 2 wires going to the voice coil, connect those wires to the new speaker and hide the field coil. No modification needs to be done to the radio, however, this is destructive to this original speaker. save the parts in case you later decide to get this one repaired.If the rest of the radio is in great shape, consider getting this one repaired.
Hope this helps!
First off, it appears that the transformer is not on the back of the speaker. What you see there is the "field coil". This is the device that provides the magnetic field.
The speaker appears to be in rather good shape. You could attempt to "recenter" the voice coil. There may be a procedure in this Phorum to do this. It usually involves ungluing the speaker cone, which may be tricky. Try this alternative procedure :
Removing any felt cover over the magnet pole and voice coil on the cone.
Loosening the 4 screws that hold the field coil and magnet piece to the speaker frame and the 2 screws that hold the "spider" to the field coil.
Place speaker on table or gently into a vice with cone side up (This will allow clearance to tighten hardware after centering.
Place shims between voice coil and field coil pole. Lift frame and lower several times.
without moving anything (and this is the tricky part) tighten all screws.
If you already tried this and failed, then remove the field coil frame by removing all 6 screws and lifting off. This way, you can inspect the voice coil.
The Phorum experts may know someone who can recone the speaker at a reasonable price.
Speakers are rated in impedance, not resistance, so the resistance reading on a DVM may not be the true impedance.
One could install a PM Speaker in the correct location, remove the field coil frame from the speaker frame, remove the connector, cut the 2 wires going to the voice coil, connect those wires to the new speaker and hide the field coil. No modification needs to be done to the radio, however, this is destructive to this original speaker. save the parts in case you later decide to get this one repaired.If the rest of the radio is in great shape, consider getting this one repaired.
Hope this helps!
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
