[Groundhog74]

I recently acquired a 512 Mandarin with the matching 211 speaker. The original coil/driver assy is dead. Coil is open and pot metal swollen and crumbling. 

I have removed the original guts and installed a modern PM speaker with an impedance matching transformer, but would like to keep it all original if possible. 

My first question is, can the pot metal sections be removed and replaced with something else.
Would the replacement have to be metal, or would some other material suffice?

Second, what type coil is needed for replacement of the open coil?

Has anyone tried this? 

Thanks for any help in advance.

[Chas]

I suppose that any structural material could be used to replace the pot metal. Only exception would iron or any material that is reinforced with iron or ferrite oxides. Those would alter the magnetic part.

Too bad someone could take up the task and create the parts with a 3D printer... chas

[Phlogiston]

Here is my last mass-dealing with pot metal:

https://www.russoldradios.com/blog/rare-and-common
You might get a few ideas there.

Russ

[Groundhog74]

Took the guts of the 211 apart to see if I could save it. Virtually everything that could be bad, was. The input coil is open. Pot metal disintegrating. The two coils around the armature are both open and the wire connecting them was so corroded it crumbled. A screw head just fell off when I touched it with a screwdriver. It’s beyond my skill level.