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 Post subject: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 3:25 pm 
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Location: Southern Maine - 03909
I was wondering what the composition of the mica sheets used in trimmer caps?...

I found this on Amazon, and was wondering if they would work (perhaps split?)..

https://www.amazon.com/Yootop-Insulating-Sheet-Holes-x0-003/dp/B07P24S6GX/ref=pd_sbs_60_6/130-9492790-5929664?_encoding=UTF8&pd_rd_i=B07P24S6GX&pd_rd_r=bed8e1cb-8f5b-47e0-adbb-a8aa7ead6caf&pd_rd_w=sjDW3&pd_rd_wg=KVKXX&pf_rd_p=43281256-7633-49c8-b909-7ffd7d8cb21e&pf_rd_r=81C32VZTFHA8H2MTB6TJ&psc=1&refRID=81C32VZTFHA8H2MTB6TJ
Quote:
Product description

Features:
Mica Plate is mica paper with silicone resin by gluing temperature and pressed, essential Parts for repairing the microwave oven or any heater.
Heat resistant; multi-layered; transparent; acid-free; archival safe.

Specification:
Suit for: TO-3 Transistor
Material: Mica, Paper, Silicone Resin
Size : 18x22x0.09mm/ 0.71"x0.87"x0.0035"(L*W)
Hole Diameter : 3.5mm
Weight: 64g
Package Content: 200(+/-2%) x Mini Mica Insulator


If not, has anyone found a source for what is needed?

Thanks!

George

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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 3:53 pm 
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Location: S. Dartmouth MA 02748-1225 USA
"Mica yourself happy!

http://shop.usamica.com/ :D

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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 6:51 pm 
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Location: Oswego, NY, USA
Paul Fix, who played North Fork's, Sherif Micah in The Rifleman TV-Western, would probably have agreed with your statement ""Mica yourself happy!".... Mica sheets are fun to play/experiment with under a PLM (Polarized Light Microscope).

Fred


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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 8:38 pm 
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Location: Santa Rosa, CA
I have successfully used TO-3 and TO-220 size transistor insulators to replace mica in trimmers.

If you can find a Kapton transistor insulator, that works also and is easier to trim or punch. https://www.distrelec.ch/en/insulation- ... p/17565054

Rich


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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 8:39 pm 
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Joined: May Tue 30, 2006 4:46 pm
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Location: Santa Rosa, CA
Someone is selling mica sheets right now on the Classified ad section.

viewtopic.php?f=15&t=362736

Rich


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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 8:45 pm 
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Rich, W3HWJ wrote:
Someone is selling mica sheets right now on the Classified ad section.

https://www.antiqueradios.com/forums/vi ... 5&t=362736

Rich
sergneri Was giving away a few sheets. Seems the sheets are all spoken for...

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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 9:45 pm 
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Location: Southern Maine - 03909
Chas wrote:
Rich, W3HWJ wrote:
Someone is selling mica sheets right now on the Classified ad section.

viewtopic.php?f=15&t=362736

Rich
sergneri Was giving away a few sheets. Seems the sheets are all spoken for...


Yes, That is what started me thinking about it.. I have a few situations where replacing the mica would probably be easier than trying to clean it, and would provide backup if some of it breaks..

I was not sure what the right material would be.. It seems that there are a couple of hybrid types, all called mica..

Thanks for any information and the links so far..

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 Post subject: Re: Question about Mica in trimmer caps
PostPosted: Aug Thu 01, 2019 10:01 pm 
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Location: Saskatoon
gkaczowka wrote:
I have a few situations where replacing the mica would probably be easier than trying to clean it...


I would just leave it alone unless I was sure that it was causing some problems. And in that case I'd try an electronic spray cleaner, the kind that doesn't leave any residue.


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