08-20-2013, 02:57 PM
Most radios will use them.
Mostly they are used in LC filter like IF filter. Those are typically low value (tens to a few hundreds of pF, or as some folks say uuF) high voltage.
They look like square flat potted greenish-brownish things, 3-4mm thick.
Most times they do not need to be changed as they are fairly stable and reliable except those very old "compressed micas" which none of my radios have.
They are not used as bypass caps.
PS. There are sometimes potted paper caps that look like mica caps. But they are larger values.
Mostly they are used in LC filter like IF filter. Those are typically low value (tens to a few hundreds of pF, or as some folks say uuF) high voltage.
They look like square flat potted greenish-brownish things, 3-4mm thick.
Most times they do not need to be changed as they are fairly stable and reliable except those very old "compressed micas" which none of my radios have.
They are not used as bypass caps.
PS. There are sometimes potted paper caps that look like mica caps. But they are larger values.
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