philco 60B mica capacitor advice - Printable Version

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philco 60B mica capacitor advice - steve_mahlberg - 12-26-2021

Hello all.
In my research, it is suggested to leave mica caps alone whenever possible for many reasons as they typically do not go bad
I am looking for advice on replacing or not replacing the .00011 uF mica capacitors in the bakelite blocks.
Now blocks on schematic numbered 13 which is a single .00011 uF and number 27 which is a double .00011 could be left alone.
They are probably not bad.
I am curious about the #33 bakelite block which is a .00011uf and a .015uf as I want to replace the .015 cap to stay on the safe side.
If I clean out that block, I would have to replace the .00011uf as well as the .015uf
Is it best to leave these all alone including that one .015, or are there good 110pF micas I could use without any serious or negative consequences to the performance of the radio.
Thanks for the help.
Steve

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RE: philco 60B mica capacitor advice - Radioroslyn - 12-26-2021

Just go ahead and replace.  The two 110pf caps are in the detector circuit and the .015 is foil/paper cap. It's going to be leaky along with all of other foil/paper caps. In general, the admonition about mica caps applies to ones in rf, IF, and coupling. Not 100% sure the 110pf are mica. When bad it will cause the volume to be low or change at will. They're just annoying.

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