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Thompson H-3 Speaker
Chas
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Posts: 713
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Joined: Apr 2018
City: S. Dartmouth State, Province, Country: MA
#20

07-31-2023, 09:24 PM
From the one pix posted, the diaphragm of the Thomson speaker appears to be "Micarta". Though the term belongs to George Westinghouse, it is phenolic resin molded with linen cloth. This material can still be bought in sheets for electrical purposes. In the speaker, the diaphragm is custom molded. Micarta is a thermosetting "plastic" resin.
https://en.wikipedia.org/wiki/Micarta

Yes, I do agree it should sound far better than a metal diaphragm, probably akin to a Thorola which has a large mica diaphragm. Epoxy or Gorilla glue can be used to repair.

If you have access to an "old school" magneto repair shop, magnetos are on older tractors, they will have a magnet charger. Generally for a couple of bucks they can re-charge the magnet.

Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
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Messages In This Thread
Thompson H-3 Speaker - by klondike98 - 03-18-2023, 10:29 PM
RE: Thompson Speaker - by morzh - 03-18-2023, 10:59 PM
RE: Thompson Speaker - by klondike98 - 03-18-2023, 11:26 PM
RE: Thompson Speaker - by MrFixr55 - 03-19-2023, 12:37 AM
RE: Thompson Speaker - by klondike98 - 03-19-2023, 03:44 AM
RE: Thompson Speaker - by MrFixr55 - 03-19-2023, 08:42 AM
RE: Thompson Speaker - by Chas - 03-19-2023, 10:56 AM
RE: Thompson Speaker - by klondike98 - 03-19-2023, 10:59 AM
RE: Thompson Speaker - by klondike98 - 03-19-2023, 11:05 AM
RE: Thompson Speaker - by klondike98 - 03-26-2023, 08:39 PM
RE: Thompson Speaker - by MrFixr55 - 03-26-2023, 09:21 PM
RE: Thompson H-3 Speaker - by klondike98 - 07-30-2023, 11:11 PM
RE: Thompson H-3 Speaker - by MrFixr55 - 07-31-2023, 03:47 PM
RE: Thompson H-3 Speaker - by klondike98 - 07-31-2023, 08:23 PM
RE: Thompson H-3 Speaker - by Chas - 07-31-2023, 09:24 PM
RE: Thompson H-3 Speaker - by klondike98 - 07-31-2023, 10:41 PM
RE: Thompson H-3 Speaker - by Chas - 07-31-2023, 11:37 PM
RE: Thompson H-3 Speaker - by klondike98 - 08-07-2023, 09:12 PM
RE: Thompson H-3 Speaker - by MrFixr55 - 08-07-2023, 11:26 PM
RE: Thompson H-3 Speaker - by klondike98 - 08-13-2023, 06:00 PM
RE: Thompson H-3 Speaker - by Chas - 08-13-2023, 07:12 PM
RE: Thompson H-3 Speaker - by EdHolland - 08-16-2023, 02:52 PM



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  1. The PHILCO Phorum
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  3. Other Radios (Non-Philco)