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 Damaged mMica Replacement in Trimmers.

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FrankB
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Join date : 2010-11-22

PostSubject: Damaged mMica Replacement in Trimmers.   June 19th 2018, 4:48 pm

I ran across a radio that had damaged mica in the 2 gang tuning capacitor trimmers or padders.
Sheet mica is hard to find these days.
 There are a couple of solutions.
1. Take the mica out of a compression trimmer or old tuning capacitor and use that.
2. Use the mica insulator for power xistors. Just cut it to size and if needed punch a hole in it with a small size paper punch (Ye,s the hand punches DO come in more than one size).

 I try to find a piece with the hole the size I need and cut it to size using the hole as the positioning guide for cutting.
Some mica can be too thick, so you can very carefully, remove layers to get it to the correct thickness.
 In the later production radios the often used a thin mylar plastic instead of mica too.you might be able to salvage that from an old pocket radio tuning cap.; as they mostly used mylar to separate the plates.
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chas
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PostSubject: Re: Damaged mMica Replacement in Trimmers.   June 19th 2018, 9:08 pm

Sheet mica can be found online as well as in wood stove shops that service as well as sell.

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Big sheets, make your own transmitting caps!

Chas
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FrankB
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PostSubject: Re: Damaged mMica Replacement in Trimmers.   June 20th 2018, 7:07 pm

Thanks for the additional info.
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