[MarkVaughn]

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

[morzh]

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

[MarkVaughn]

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

[morzh]

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)