03-16-2019, 09:04 PM
The Philco service sheet clearly indicates 3B as the oscillator trimmer. That's all I can say about it.
It's been a while since I owned a 39-7. 6A could be one of those "semi-fixed" trimmers Philco used in some models of around that period (1938-39), which looks like a trimmer cap but was adjusted and sealed at the factory. Why they did this rather than using a fixed mica cap, who knows other than some models needed more or less capacitance?
If this is the case, do not make any attempt to adjust 6A.
It's been a while since I owned a 39-7. 6A could be one of those "semi-fixed" trimmers Philco used in some models of around that period (1938-39), which looks like a trimmer cap but was adjusted and sealed at the factory. Why they did this rather than using a fixed mica cap, who knows other than some models needed more or less capacitance?
If this is the case, do not make any attempt to adjust 6A.
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Ron Ramirez
Ferdinand IN
