3 wire speaker, 3rd wire?

[Steve in Denver]

Anyone know what the 3rd wire is for on the early speakers? I don't have a wiring diagram.

It needed to be re-coned, the speaker guy took it apart and does not know how to put it back together.

[Steve in Denver]

I did find my old posting, left wire from radio, center wire ground, right wire gets power from the radio. Anyone have one they want to sell?

[MAG]

For Schematic of your radio.

https://www.rfcafe.com/references/ra...adio-craft.htm

[rotorwrench]

A lot of the early radio speakers had electromagnets on the cone coil since iron magnets didn't hold magnetic gauss very well. Rare earth type magnets didn't show up till after WWII and it took a while before they were widely used.

[Zeke3]

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Originally Posted by MAG

For Schematic of your radio.

https://www.rfcafe.com/references/ra...adio-craft.htm

MAG, thanks for this link. I was able to find the schematics and adjustment information for my Philco F-1440 radio for a 1937 model. Lots of information on old radios there.