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Philco 46-480 Replacing Field Coil w/ Perm Mag (I know I know)
RetroRev
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City: Ventura State, Province, Country: CA
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09-10-2022, 02:23 PM
Hey yall and thanks for having me on the forum!

I've got a Philco 46-480 which I got a few years ago and am finally getting around to working on. It's been recapped and seems to all be in good working order as well as cosmetically, though it is missing the entire speaker setup as well as the plug for said speaker. 

So, as I'm sure is common knowledge here, when replacing a field coil speaker with a permanent magnet speaker you have to put a resistor in line to take the place of the voice coil. 

My problem is, I've seen three different versions of the schematics that all have different values for it. 

One says 510 ohm, another says 1k and a third I found says 3ohm

I put in a 1k 50w and got nothing.

Before I go any further, is there a step I'm missing?

Does anyone know the proper resistance value I need?


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Philco 46-480 Replacing Field Coil w/ Perm Mag (I know I know) - by RetroRev - 09-10-2022, 02:23 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration