Philco 84 field coil wire size - Printable Version

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+--- Thread: Philco 84 field coil wire size (/showthread.php?tid=23390)

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Philco 84 field coil wire size - Ctkid - 03-20-2022

Hello,

I have a bad field coil on my Philco 84 and will try rewinding it. I was able to get the field coil assembly apart and access the coil itself but am not sure of the wire gauge size. I think it might be 35 gauge but would like to know if anyone knows for sure?

Regards,
Ctkid

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RE: Philco 84 field coil wire size - Radioroslyn - 03-20-2022

From what I can tell the coil is rated for 40ma. 35G is good for 42ma as per The Radio Amateur's Handbook 1956 edition

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RE: Philco 84 field coil wire size - Chas - 03-21-2022

The wire size can be measured with a mechanical micrometer or caliper. Allow a couple of thousands for the film insulation.

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RE: Philco 84 field coil wire size - Ctkid - 03-21-2022

Thanks for your responses!

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RE: Philco 84 field coil wire size - Arran - 03-24-2022

I don't know, 40 ma seems kind of low for a set with a #42 output tube, the #80 rectifier tube is rated for 125 ma I think. I would try measuring the actual wire used in the field coil. Of course I am assuming the the field coil in the model 84 is used as a filter choke in the positive side of the B+ circuit, and not in the negative side on the bias supply, which would require a lower current rating.
Regards
Arran

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RE: Philco 84 field coil wire size - Radioroslyn - 03-24-2022

Philco spec the coil at 40ma for that K speaker.

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RE: Philco 84 field coil wire size - Ron Ramirez - 03-24-2022

The speaker used in Model 84 is type SB (not a K) and it has an 1140 ohm field coil rated at 50 mA.

(source: the Philco Speakers spreadsheet, downloadable at this link on this site.)

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