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They do not. They are not polarized like electrolytics. The black band indicates the "Foil side" of an old wax / paper cap. So you would want to connect that foil side to ground to help reduce noise. if you connected the foil side to a sensitive input, it would pick up hum and noise. Modern film caps like I have used dont have this issue anymore.
No, you cant. Silver Mica are designed to withstand RF heating and still hold there value. They are usually placed in a circuit that needs to be RF stable and reasonably free of drift. As a general rule, Silver Micas are not replaced during recapping. They are only replaced if they are proven bad. They seldom go wrong.
Please subscribe if you are enjoying our series of videos on this channel. Help us build a strong community of those who enjoy restoring and curating old radios!
Hello Mike! another great video keep them coming!
Do the wax capacitors you replaced have polarity? I see a black stripe/band on one side. Thanks for your help and your videos
They do not. They are not polarized like electrolytics. The black band indicates the "Foil side" of an old wax / paper cap. So you would want to connect that foil side to ground to help reduce noise. if you connected the foil side to a sensitive input, it would pick up hum and noise. Modern film caps like I have used dont have this issue anymore.
Thanks Mike for your videos. Can I replace a mica cap with a regular cap that replaces the paper caps. Kind regards
No, you cant. Silver Mica are designed to withstand RF heating and still hold there value. They are usually placed in a circuit that needs to be RF stable and reasonably free of drift. As a general rule, Silver Micas are not replaced during recapping. They are only replaced if they are proven bad. They seldom go wrong.
@@MikesRadioRepairRestoration Thank you Mike. I appreciate you reply.
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