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 Post subject: mica caps -what voltage to order
PostPosted: Mar Thu 26, 2020 1:05 am 
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Joined: Jan Thu 29, 2009 9:10 pm
Posts: 704
Location: central wisconsin, 54449
Hi to everyone, I will be recapping a 1948 ge radio. there are some mica caps in the circuit. The schematic gives voltages for all the rest of the caps, but not for the the mica. Mouser has a choice between either 500 volts or 1000 volts for the mica caps which ones should I go for?

my thanks in advance


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 Post subject: Re: mica caps -what voltage to order
PostPosted: Mar Thu 26, 2020 1:13 am 
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Joined: Feb Wed 07, 2018 6:52 pm
Posts: 724
Location: Stone Mountain, GA
500 should be fine for a radio.

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 Post subject: Re: mica caps -what voltage to order
PostPosted: Mar Thu 26, 2020 2:54 pm 
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Joined: Jun Wed 08, 2011 2:33 am
Posts: 10366
Location: Ohio 45177
Why do you believe the micas need replaced? Not that they may not, but I have never had issues with them in AM BC radios of the common types. That does not include the ones that get noisy in IF transformers, I am speaking of the postage stamp types in the RF circuits. They could go bad but nothing like paper caps in the rest of the radio.

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 Post subject: Re: mica caps -what voltage to order
PostPosted: Mar Thu 26, 2020 3:00 pm 
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Joined: Jul Mon 26, 2010 8:30 pm
Posts: 28157
Location: Annapolis, MD
As a general rule, I do not replace micas "on sight". But, there are some brands generally reported to be trouble. One good method is to test a few---if bad, then replace all similar.

In the RF and IF circuits, the common rating of 500 volts is more than adequate.

Consider buying an assortment from someplace like JustRadios or Sal's

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"Even if you don't understand Ohm's Law, you are still required to obey it."


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