02-27-2010, 10:50 PM
According to this website, TFB, you are correct.
But I wonder about 3000 pF in that circuit?
Very interesting. The primary of that IF transformer is slug tuned, as are many 1940-42 Philco IFs, and it uses that mica cap in parallel with the primary winding.
Being a Micamold cap, it's hard to say if it really is mica or not. Some Micamold caps have a paper cap encapsulated in that package that looks like a mica cap. The Micamolds are beginning to fail at a rising rate, also.
I would replace it with a new mica cap or an NP0 ceramic to avoid drift while in operation.
But I wonder about 3000 pF in that circuit?
Very interesting. The primary of that IF transformer is slug tuned, as are many 1940-42 Philco IFs, and it uses that mica cap in parallel with the primary winding.
Being a Micamold cap, it's hard to say if it really is mica or not. Some Micamold caps have a paper cap encapsulated in that package that looks like a mica cap. The Micamolds are beginning to fail at a rising rate, also.
I would replace it with a new mica cap or an NP0 ceramic to avoid drift while in operation.
--
Ron Ramirez
Ferdinand IN
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