Philco 50-920, Code 123 C4 Fixed Trimmer - Printable Version

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Philco 50-920, Code 123 C4 Fixed Trimmer - MarkVaughn - 06-29-2024

Restoring this unit, and finally found the Code 123 documentation.  Question:  C4 temp comp. Fixed trimmer is 13 picofarad, as the change indicates.  Is this a tubular mica of some sort, and do I really need to replace it?  Same question for C6, 47 pF on the 50C5 tube.  

For these types of radios, I always replace all wax caps and resistors. 

This is my first post on this group.  THANKS MUCH  
Mark

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RE: Philco 50-920, Code 123 C4 Fixed Trimmer - morzh - 06-29-2024

You do not replace ceramic or mica caps, unless you have some reason to believe they are bad.

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RE: Philco 50-920, Code 123 C4 Fixed Trimmer - MarkVaughn - 06-29-2024

Thanks much! I suppose, because of the stated values in pF, that they are mica?
Mark

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RE: Philco 50-920, Code 123 C4 Fixed Trimmer - morzh - 06-29-2024

If tubular (an empty small cylinder) - they are likely ceramic. A photo would help.
Mica caps are typically rectangular, while ceramic can be anything, disc, rectangular and tubular.
(strictly speaking, mica are ceramic caps, but usually they stand apart)

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